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5) #include "head.wmi" TITLE="Tor Project: FAQ" CHARSET="UTF-8"
6) <div id="content" class="clearfix">
7)   <div id="breadcrumbs">

8)     <a href="<page index>">Home &raquo; </a>

9)     <a href="<page docs/documentation>">Documentation &raquo; </a>
10)     <a href="<page docs/faq>">FAQ</a>
11)   </div>
12)   <div id="maincol">
13)     <!-- PUT CONTENT AFTER THIS TAG -->
14)     <h1>Tor FAQ</h1>

15)     <hr>

16) 

17)     <p><a href="#General">General questions:</a><br />
18)     <a href="#CompilationAndInstallation">Compilation and Installation:</a><br />

19)     <a href="#TBBGeneral">Tor Browser (general):</a><br />
20)     <a href="#TBB3.x">Tor Browser (3.x and later):</a><br />

21)     <a href="#AdvancedTorUsage">Advanced Tor usage:</a><br />
22)     <a href="#RunningATorRelay">Running a Tor relay:</a><br />
23)     <a href="#TorHiddenServices">Tor hidden services:</a><br />
24)     <a href="#Development">Development:</a><br />
25)     <a href="#AnonymityAndSecurity">Anonymity and Security:</a><br />
26)     <a href="#AlternateDesigns">Alternate designs that we don't do (yet):</a><br />
27)     <a href="#Abuse">Abuse:</a></p>

28) 

29) <hr>
30) 
31)     <p>General questions:</p>

32)     <ul>
33)     <li><a href="#WhatIsTor">What is Tor?</a></li>

34)     <li><a href="#Torisdifferent">How is Tor different from other
35) proxies?</a></li>

36)     <li><a href="#CompatibleApplications">What programs can I use with
37)     Tor?</a></li>
38)     <li><a href="#WhyCalledTor">Why is it called Tor?</a></li>
39)     <li><a href="#Backdoor">Is there a backdoor in Tor?</a></li>

40)     <li><a href="#DistributingTor">Can I distribute Tor?</a></li>

41)     <li><a href="#SupportMail">How can I get support?</a></li>

42)     <li><a href="#Forum">Is there a Tor forum?</a></li>

43)     <li><a href="#WhySlow">Why is Tor so slow?</a></li>

44)     <li><a href="#FileSharing">How can I share files anonymously through Tor?
45)     </a></li>

46)     <li><a href="#Funding">What would The Tor Project do with more
47)     funding?</a></li>

48)     <li><a href="#IsItWorking">How can I tell if Tor is working, and that my

49)     connections really are anonymized?</a></li>

50)     <li><a href="#Mobile">Can I use Tor on my phone or mobile device?</a></li>

51)     <li><a href="#OutboundPorts">Which outbound ports must be open when
52)     using Tor as a client?</a></li>

53)     <li><a href="#FTP">How do I use my browser for ftp with Tor?</a></li>

54)     <li><a href="#NoDataScrubbing">Does Tor remove personal information

55)     from the data my application sends?</a></li>

56)     <li><a href="#Metrics">How many people use Tor? How many relays or
57)     exit nodes are there?</a></li>

58)     <li><a href="#SSLcertfingerprint">What are your SSL certificate

59)     fingerprints?</a></li>

60)     </ul>

61) 

62)     <p>Compilation and Installation:</p>

63) 

64)     <ul>
65)     <li><a href="#HowUninstallTor">How do I uninstall Tor?</a></li>
66)     <li><a href="#PGPSigs">What are these "sig" files on the download
67)     page?</a></li>

68)     <li><a href="#GetTor">Your website is blocked in my country. How
69)     do I download Tor?</a></li>

70)     <li><a href="#VirusFalsePositives">Why does my Tor executable appear to

71)     have a virus or spyware?</a></li>

72)     <li><a href="#tarballs">How do I open a .tar.gz or .tar.xz file?</a></li>

73)     <li><a href="#LiveCD">Is there a LiveCD or other bundle that
74) includes Tor?</a></li>

75)     </ul>

76) 

77)     <p>Tor Browser (general):</p>

78)     <ul>

79) 

80)     <li><a href="#TBBFlash">Why can't I view videos on YouTube and other
81)     Flash-based sites?</a></li>

82)     <li><a href="#Ubuntu">I'm using Ubuntu, and I can't start Tor Browser.

83)     </a></li>

84)     <li><a href="#SophosOnMac">I'm using the Sophos anti-virus

85)     software on my Mac, and Tor starts but I can't browse anywhere.</a></li>

86)     <li><a href="#XPCOMError">When I start Tor Browser I get an 
87) error message: "Cannot load XPCOM".</a></li>

88)     <li><a href="#TBBOtherExtensions">Can I install other Firefox

89)     extensions? Which extensions should I avoid using?</a></li>

90)     <li><a href="#TBBJavaScriptEnabled">Why is NoScript configured to

91) allow JavaScript by default in Tor Browser?  Isn't that

92) unsafe?</a></li>

93)     <li><a href="#TBBOtherBrowser">I want to use Chrome/IE/Opera/etc
94)     with Tor.</a></li>

95)     <li><a href="#GoogleCAPTCHA">Google makes me solve a CAPTCHA or tells

96)     me I have spyware installed.</a></li>

97)     <li><a href="#ForeignLanguages">Why does Google show up in foreign

98)     languages?</a></li>

99)     <li><a href="#GmailWarning">Gmail warns me that my account may have
100)     been compromised.</a></li>

101)     <li><a href="#NeedToUseAProxy">My internet connection requires an HTTP

102)     or SOCKS Proxy</a></li>

103)     <li><a href="#TBBSocksPort">I want to
104)     run another application through Tor.</a></li>

105)     <li><a href="#CantSetProxy">What should I do if I can't set a proxy

106)     with my application?</a></li>

107)     </ul>
108) 

109)     <p>Tor Browser (3.x and later):</p>

110) 
111)     <ul>

112)     <li><a href="#WhereDidVidaliaGo">Where did the world map (Vidalia)

113)     go?</a></li>
114)     <li><a href="#DisableJS">How do I disable JavaScript?</a></li>

115)     <li><a href="#VerifyDownload">How do I verify the download

116)     (sha256sums.txt)?</a></li>

117)     <li><a href="#NewIdentityClosingTabs">Why does "New Identity" close

118)     all my open tabs?</a></li>

119)     <li><a href="#ConfigureRelayOrBridge">How do I configure Tor as a relay

120)     or bridge?</a></li>
121)     <li><a href="#Timestamps">Why are the file timestamps from 2000?</a></li>

122)     <li><a href="#TBBSourceCode">Where is the source code for Tor Browser? 
123)     How do I verify a build?</a></li>

124)     </ul>
125) 

126)     <p>Advanced Tor usage:</p>

127) 

128)     <ul>
129)     <li><a href="#torrc">I'm supposed to "edit my torrc". What does
130)     that mean?</a></li>

131)     <li><a href="#Logs">How do I set up logging, or see Tor's

132)     logs?</a></li>

133)     <li><a href="#LogLevel">What log level should I use?</a></li>

134)     <li><a href="#DoesntWork">Tor is running, but it's not working
135)     correctly.</a></li>

136)     <li><a href="#TorCrash">My Tor keeps crashing.</a></li>

137)     <li><a href="#ChooseEntryExit">Can I control which nodes (or
138) country)

139)     are used for entry/exit?</a></li>

140)     <li><a href="#FirewallPorts">My firewall only allows a few outgoing
141)     ports.</a></li>

142)     <li><a href="#DefaultExitPorts">Is there a list of default exit ports?</a></li>

143)     <li><a href="#WarningsAboutSOCKSandDNSInformationLeaks">I keep seeing
144)     these warnings about SOCKS and DNS information leaks. Should I

145)     worry?</a></li>

146)     <li><a href="#SocksAndDNS">How do I check if my application that uses

147)     SOCKS is leaking DNS requests?</a></li>

148)     </ul>

149) 

150)     <p>Running a Tor relay:</p>

151)     <ul>

152) 
153)     <li><a href="#HowDoIDecide">How do I decide if I should run a relay?
154)     </a></li>

155)     <li><a href="#WhyIsntMyRelayBeingUsedMore">Why isn't my relay being

156)     used more?</a></li>

157)     <li><a href="#IDontHaveAStaticIP">I don't have a static IP.</a></li>

158)     <li><a href="#PortscannedMore">Why do I get portscanned more often

159)     when I run a Tor relay?</a></li>

160)     <li><a href="#HighCapacityConnection">How can I get Tor to fully

161)     make use of my high capacity connection?</a></li>

162)     <li><a href="#RelayFlexible">How stable does my relay need to
163) be?</a></li>

164)     <li><a href="#BandwidthShaping">What bandwidth shaping options are

165)     available to Tor relays?</a></li>

166)     <li><a href="#LimitTotalBandwidth">How can I limit the total amount

167)     of bandwidth used by my Tor relay?</a></li>

168)     <li><a href="#RelayWritesMoreThanItReads">Why does my relay write

169)     more bytes onto the network than it reads?</a></li>

170)     <li><a href="#Hibernation">Why can I not browse anymore after

171)     limiting bandwidth on my Tor relay?</a></li>

172)     <li><a href="#ExitPolicies">I'd run a relay, but I don't want to deal

173)     with abuse issues.</a></li>

174)     <li><a href="#BestOSForRelay">Why doesn't my Windows (or other OS) Tor

175)     relay run well?</a></li>

176)     <li><a href="#PackagedTor">Should I install Tor from my package manager,

177)     or build from source?</a></li>

178)     <li><a href="#WhatIsTheBadExitFlag">What is the BadExit flag?</a></li>

179)     <li><a href="#IGotTheBadExitFlagWhyDidThatHappen">I got the BadExit flag.

180)     Why did that happen?</a></li>

181)     <li><a href="#MyRelayRecentlyGotTheGuardFlagAndTrafficDroppedByHalf">My

182)     relay recently got the Guard flag and traffic dropped by half.</a></li>

183)     <li><a href="#TorClientOnADifferentComputerThanMyApplications">I want to run my Tor client on a

184)     different computer than my applications.</a></li>

185)     <li><a href="#ServerClient">Can I install Tor on a central server, and

186)     have my clients connect to it?</a></li>

187)     <li><a href="#JoinTheNetwork">So I can just configure a nickname and

188)     ORPort and join the network?</a></li>

189)     <li><a href="#RelayOrBridge">Should I be a normal relay or bridge
190)     relay?</a></li>

191)     <li><a href="#UpgradeOrMove">I want to upgrade/move my relay. How do I

192)     keep the same key?</a></li>

193)     <li><a href="#MultipleRelays">I want to run more than one
194) relay.</a></li>

195)     <li><a href="#NTService">How do I run my Tor relay as an NT service?
196)     </a></li>

197)     <li><a href="#VirtualServer">Can I run a Tor relay from my virtual server

198)     account?</a></li>

199)     <li><a href="#WrongIP">My relay is picking the wrong IP address.</a></li>
200)     <li><a href="#BehindANAT">I'm behind a NAT/Firewall</a></li>

201)     <li><a href="#OutgoingFirewall">How should I configure the outgoing filters on my relay?</a></li>

202)     <li><a href="#RelayMemory">Why is my Tor relay using so much memory?
203)     </a></li>
204)     <li><a href="#BetterAnonymity">Do I get better anonymity if I run a relay?
205)     </a></li>

206)     <li><a href="#FacingLegalTrouble">I'm facing legal trouble. How do I

207)     prove that my server was a Tor relay at a given time?</a></li>

208)     <li><a href="#RelayDonations">Can I donate for a relay rather than
209)     run my own?</a></li>

210)     </ul>

211) 

212)     <p>Tor hidden services:</p>

213) 

214)     <ul>
215)     <li><a href="#AccessHiddenServices">How do I access hidden services?</a></li>

216)     <li><a href="#ProvideAHiddenService">How do I provide a hidden service?</a></li>

217)     </ul>

218) 

219)     <p>Development:</p>

220) 

221)     <ul>

222)     <li><a href="#VersionNumbers">What do these weird version numbers

223)     mean?</a></li>
224)     <li><a href="#PrivateTorNetwork">How do I set up my own private
225)     Tor network?</a></li>

226)     <li><a href="#UseTorWithJava">How can I make my Java program use the

227)     Tor network?</a></li>
228)     <li><a href="#WhatIsLibevent">What is Libevent?</a></li>

229)     <li><a href="#MyNewFeature">What do I need to do to get a new feature

230)     into Tor?</a></li>
231)     </ul>
232) 

233)     <p>Anonymity and Security:</p>

234)     <ul>

235)     <li><a href="#WhatProtectionsDoesTorProvide">What protections does Tor

236)     provide?</a></li>

237)     <li><a href="#CanExitNodesEavesdrop">Can exit nodes eavesdrop on

238)     communications? Isn't that bad? </a></li>

239)     <li><a href="#AmITotallyAnonymous">So I'm totally anonymous if I use

240)     Tor?</a></li>

241)     <li><a href="#KeyManagement">Tell me about all the keys Tor
242) uses.</a></li>

243)     <li><a href="#EntryGuards">What are Entry Guards?</a></li>

244)     <li><a href="#ChangePaths">How often does Tor change its paths?</a></li>

245)     <li><a href="#CellSize">Tor uses hundreds of bytes for every IRC line. I

246)     can't afford that!</a></li>

247)     <li><a href="#OutboundConnections">Why does netstat show these outbound

248)     connections?</a></li>
249)     <li><a href="#PowerfulBlockers">What about powerful blocking mechanisms
250)     </a></li>

251)     <li><a href="#RemotePhysicalDeviceFingerprinting">Does Tor resist

252)     "remote physical device fingerprinting"?</a></li>

253)     <li><a href="#IsTorLikeAVPN">Is Tor like a VPN?</a></li>

254)     <li><a href="#Proxychains">Aren't 10 proxies (proxychains) better than

255)     Tor with only 3 hops?</a></li>

256)     <li><a href="#AttacksOnOnionRouting">What attacks remain against onion

257)     routing?</a></li>

258)     <li><a href="#LearnMoreAboutAnonymity">Where can I learn more about anonymity?</a></li>

259)     </ul>

260) 

261)     <p>Alternate designs that we don't do (yet):</p>

262) 

263)     <ul>
264)     <li><a href="#EverybodyARelay">You should make every Tor user be a
265)     relay.</a></li>

266)     <li><a href="#TransportIPnotTCP">You should transport all IP
267) packets,

268)     not just TCP packets.</a></li>

269)     <li><a href="#HideExits">You should hide the list of Tor relays,
270)     so people can't block the exits.</a></li>

271)     <li><a href="#ChoosePathLength">You should let people choose their path

272)     length.</a></li>

273)     <li><a href="#SplitEachConnection">You should split each connection over

274)     many paths.</a></li>

275)     <li><a href="#MigrateApplicationStreamsAcrossCircuits">You should migrate

276)     application streams across circuits.</a></li>

277)     <li><a href="#LetTheNetworkPickThePath">You should let the network pick

278)     the path, not the client.</a></li>

279)     <li><a href="#UnallocatedNetBlocks">Your default exit policy should block

280)     unallocated net blocks too.</a></li>

281)     <li><a href="#BlockWebsites">Exit policies should be able to block

282)     websites, not just IP addresses.</a></li>

283)     <li><a href="#BlockContent">You should change Tor to prevent users from

284)     posting certain content.</a></li>

285)     <li><a href="#SendPadding">You should send padding so it's more secure.
286)     </a></li>

287)     <li><a href="#Steganography">You should use steganography to hide Tor

288)     traffic.</a></li>

289)     </ul>

290) 

291)     <p>Abuse:</p>

292)     <ul>

293)     <li><a href="#Criminals">Doesn't Tor enable criminals to do bad
294) things?</a></li>

295)     <li><a href="#RespondISP">How do I respond to my ISP about my exit
296)     relay?</a></li>

297)     <li><a href="#HelpPoliceOrLawyers">I have questions about
298)    a Tor IP address for a legal case.</a></li>

299)     </ul>

300) 

301)     <p>For other questions not yet on this version of the FAQ, see the
302) <a

303)     href="<wikifaq>">wiki FAQ</a> for now.</p>

304) 

305)     <hr>

306) 

307)     <a id="General"></a>

308)     <h2><a class="anchor">General:</a></h2>

309) 

310)     <a id="WhatIsTor"></a>
311)     <h3><a class="anchor" href="#WhatIsTor">What is Tor?</a></h3>

312) 

313)     <p>
314)     The name "Tor" can refer to several different components.
315)     </p>

316) 

317)     <p>

318)     The Tor software is a program you can run on your computer that
319) helps keep
320)     you safe on the Internet. Tor protects you by bouncing your
321) communications

322)     around a distributed network of relays run by volunteers all around

323)     the world: it prevents somebody watching your Internet connection
324) from

325)     learning what sites you visit, and it prevents the sites you visit

326)     from learning your physical location. This set of volunteer relays
327) is
328)     called the Tor network. You can read more about how Tor works on the
329) <a

330)     href="<page about/overview>">overview page</a>.
331)     </p>

332) 

333)     <p>

334)     The Tor Project is a non-profit (charity) organization that
335) maintains

336)     and develops the Tor software.
337)     </p>

338) 

339)     <hr>

340) 

341)     <a id="Torisdifferent"></a>

342)     <h3><a class="anchor" href="#Torisdifferent">How is Tor different
343) from other proxies?</a></h3>
344)     <p>
345)     A typical proxy provider sets up a server somewhere on the Internet
346) and
347) allows you to use it to relay your traffic.  This creates a simple, easy
348) to
349) maintain architecture.  The users all enter and leave through the same
350) server.
351) The provider may charge for use of the proxy, or fund their costs
352) through
353) advertisements on the server.  In the simplest configuration, you don't
354) have to
355) install anything.  You just have to point your browser at their proxy
356) server.
357) Simple proxy providers are fine solutions if you do not want protections
358) for
359) your privacy and anonymity online and you trust the provider from doing
360) bad
361) things.  Some simple proxy providers use SSL to secure your connection
362) to them.
363) This may protect you against local eavesdroppers, such as those at a
364) cafe with

365) free wifi Internet.
366)     </p>
367)     <p>

368)     Simple proxy providers also create a single point of failure.  The
369) provider
370) knows who you are and where you browse on the Internet.  They can see
371) your
372) traffic as it passes through their server.  In some cases, they can even
373) see

374) inside your

375) encrypted traffic as they relay it to your banking site or to ecommerce
376) stores.

377) You have to trust the provider isn't doing any number of things, such as

378) watching your traffic, injecting their own advertisements into your
379) traffic

380) stream, and recording your personal details.

381)     </p>
382)     <p>

383)     Tor passes your traffic through at least 3 different servers before
384) sending
385) it on to the destination. Because there's a separate layer of encryption
386) for
387) each of the three relays, Tor does not modify, or even know, what you
388) are
389) sending into it.  It merely relays your traffic, completely encrypted
390) through
391) the Tor network and has it pop out somewhere else in the world,
392) completely
393) intact.  The Tor client is required because we assume you trust your
394) local
395) computer.  The Tor client manages the encryption and the path chosen
396) through
397) the network.  The relays located all over the world merely pass
398) encrypted

399) packets between themselves.</p>

400)     <p>
401)     <dl>

402)     <dt>Doesn't the first server see who I am?</dt><dd>Possibly. A bad
403) first of
404) three servers can see encrypted Tor traffic coming from your computer.
405) It
406) still doesn't know who you are and what you are doing over Tor.  It
407) merely sees
408) "This IP address is using Tor".  Tor is not illegal anywhere in the
409) world, so
410) using Tor by itself is fine.  You are still protected from this node
411) figuring

412) out who you are and where you are going on the Internet.</dd>

413)     <dt>Can't the third server see my traffic?</dt><dd>Possibly.  A bad
414) third
415) of three servers can see the traffic you sent into Tor.  It won't know
416) who sent

417) this traffic.  If you're using encryption, such as visiting a bank or

418) e-commerce website, or encrypted mail connections, etc, it will only
419) know the
420) destination.  It won't be able to see the data inside the traffic
421) stream.  You

422) are still protected from this node figuring out who you are and if using
423) encryption, what data you're sending to the destination.</dd>

424)     </dl>
425)     </p>

426) 

427)     <hr>

428) 

429) 

430)     <a id="CompatibleApplications"></a>

431)     <h3><a class="anchor" href="#CompatibleApplications">What programs
432) can I use with Tor?</a></h3>

433) 

434)     <p>

435)     If you want to use Tor with a web browser, we provide the Tor Browser,
436)     which includes everything you need to browse the web safely using

437)     Tor. If you want to use another web browser with Tor, see <a
438)     href="#TBBOtherBrowser">Other web browsers</a>.

439)     </p>
440)     <p>
441)     There are plenty of other programs you can use with Tor,
442)     but we haven't researched the application-level anonymity

443)     issues on all of them well enough to be able to recommend a safe

444)     configuration. Our wiki has a list of instructions for <a

445)     href="<wiki>doc/TorifyHOWTO">Torifying

446)     specific applications</a>.

447)     Please add to these lists and help us keep them accurate!
448)     </p>

449) 

450)     <hr>

451) 

452)     <a id="WhyCalledTor"></a>

453)     <h3><a class="anchor" href="#WhyCalledTor">Why is it called
454) Tor?</a></h3>

455) 

456)     <p>
457)     Because Tor is the onion routing network. When we were starting the
458)     new next-generation design and implementation of onion routing in
459)     2001-2002, we would tell people we were working on onion routing,
460)     and they would say "Neat. Which one?" Even if onion routing has
461)     become a standard household term, Tor was born out of the actual <a
462)     href="http://www.onion-router.net/">onion routing project</a> run by
463)     the Naval Research Lab.
464)     </p>

465) 

466)     <p>
467)     (It's also got a fine translation from German and Turkish.)
468)     </p>

469) 

470)     <p>

471)     Note: even though it originally came from an acronym, Tor is not
472) spelled

473)     "TOR". Only the first letter is capitalized. In fact, we can usually

474)     spot people who haven't read any of our website (and have instead
475) learned
476)     everything they know about Tor from news articles) by the fact that
477) they

478)     spell it wrong.
479)     </p>

480) 

481)     <hr>

482) 

483)     <a id="Backdoor"></a>

484)     <h3><a class="anchor" href="#Backdoor">Is there a backdoor in
485) Tor?</a></h3>

486) 

487)     <p>

488)     There is absolutely no backdoor in Tor.  We know some smart lawyers
489)     who say that it's unlikely that anybody will try to make us add one
490)     in our jurisdiction (U.S.). If they do ask us, we will fight them,
491)     and (the lawyers say) probably win.

492)     </p>

493) 

494)     <p>
495)     We think that putting a backdoor in Tor would be tremendously

496)     irresponsible to our users, and a bad precedent for security

497)     software in general. If we ever put a deliberate backdoor in our
498)     security software, it would ruin our professional reputations.
499)     Nobody would trust our software ever again — for excellent
500)     reason!

501)     </p>

502) 

503)     <p>
504)     But that said, there are still plenty of subtle attacks
505)     people might try. Somebody might impersonate us, or break into our

506)     computers, or something like that. Tor is open source, and you

507)     should always check the source (or at least the diffs since the last
508)     release) for suspicious things. If we (or the distributors) don't
509)     give you source, that's a sure sign something funny might be going
510)     on. You should also check the <a href="<page
511)     docs/verifying-signatures>">PGP signatures</a> on the releases, to
512)     make sure nobody messed with the distribution sites.

513)     </p>

514) 

515)     <p>
516)     Also, there might be accidental bugs in Tor that could affect your

517)     anonymity. We periodically find and fix anonymity-related bugs, so

518)     make sure you keep your Tor versions up-to-date.

519)     </p>

520) 

521)     <hr>

522) 

523)     <a id="DistributingTor"></a>

524)     <h3><a class="anchor" href="#DistributingTor">Can I distribute
525) Tor?</a></h3>

526) 

527)     <p>
528)     Yes.
529)     </p>

530) 

531)     <p>

532)     The Tor software is <a href="https://www.fsf.org/">free software</a>. This
533)     means we give you the rights to redistribute the Tor software, either
534)     modified or unmodified, either for a fee or gratis. You don't have to

535)     ask us for specific permission.
536)     </p>

537) 

538)     <p>

539)     However, if you want to redistribute the Tor software you must follow our

540)     <a href="<gitblob>LICENSE">LICENSE</a>.

541)     Essentially this means that you need to include our LICENSE file along

542)     with whatever part of the Tor software you're distributing.
543)     </p>

544) 

545)     <p>

546)     Most people who ask us this question don't want to distribute just the

547)     Tor software, though. They want to distribute the <a

548)     href="<page projects/torbrowser>">Tor Browser</a>. This includes <a

549)     href="https://www.mozilla.org/en-US/firefox/organizations/">Firefox

550)     Extended Support Release</a>, and the NoScript and HTTPS-Everywhere
551)     extensions. You will need to follow the license for those programs as
552)     well. Both of those Firefox extensions are distributed under

553)     the <a href="https://www.fsf.org/licensing/licenses/gpl.html">GNU General

554)     Public License</a>, while Firefox ESR is released under the Mozilla Public
555)     License. The simplest way to obey their licenses is to include the source
556)     code for these programs everywhere you include the bundles themselves.

557)     </p>

558) 

559)     <p>

560)     Also, you should make sure not to confuse your readers about what Tor is,
561)     who makes it, and what properties it provides (and doesn't provide). See
562)     our <a href="<page docs/trademark-faq>">trademark FAQ</a> for details.

563)     </p>

564) 

565)     <p>
566)     Lastly, you should realize that we release new versions of the
567)     Tor software frequently, and sometimes we make backward incompatible

568)     changes. So if you distribute a particular version of the Tor software, it
569)     may not be supported — or even work — six months later. This

570)     is a fact of life for all security software under heavy development.
571)     </p>

572) 

573)     <hr>

574) 

575)     <a id="SupportMail"></a>

576)     <h3><a class="anchor" href="#SupportMail">How can I get
577) support?</a></h3>

578) 

579)     <p>Your best bet is to first try the following:</p>

580)     <ol>
581)     <li>Read through this <a href="<page docs/faq>">FAQ</a>.</li>

582)     <li>Read through the <a href="<page
583) docs/documentation>">documentation</a>.</li>

584)     <li>Read through the <a

585) 
586) href="https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk">
587) tor-talk

588)     archives</a> and see if your question is already answered.</li>

589)     <li>Join our <a href="ircs://irc.torproject.org#tor">irc channel</a>
590) and

591)     state the issue and wait for help.</li>

592)     <li>Send an email to <a

593) 
594) href="mailto:help@rt.torproject.org">help@rt.torproject.org</a>.</li>
595)     <li>If all else fails, try <a href="<page about/contact>">contacting
596) us</a> directly.</li>

597)     </ol>

598) 

599)     <p>If you find your answer, please stick around on the IRC channel
600) or the

601)     mailing list to help others who were once in your position.</p>

602) 

603)     <hr>

604) 

605)     <a id="Forum"></a>
606)     <h3><a class="anchor" href="#Forum">Is there a Tor forum?</a></h3>
607) 

608)     <p>We have a <a href="https://tor.stackexchange.com/">StackExchange

609)     page</a> that is currently in public beta.

610)     </p>
611) 
612)     <hr>
613) 

614)     <a id="WhySlow"></a>
615)     <h3><a class="anchor" href="#WhySlow">Why is Tor so slow?</a></h3>

616) 

617)     <p>
618)     There are many reasons why the Tor network is currently slow.
619)     </p>

620) 

621)     <p>

622)     Before we answer, though, you should realize that Tor is never going
623) to
624)     be blazing fast. Your traffic is bouncing through volunteers'
625) computers
626)     in various parts of the world, and some bottlenecks and network
627) latency

628)     will always be present. You shouldn't expect to see university-style
629)     bandwidth through Tor.
630)     </p>

631) 

632)     <p>

633)     But that doesn't mean that it can't be improved. The current Tor
634) network
635)     is quite small compared to the number of people trying to use it,
636) and
637)     many of these users don't understand or care that Tor can't
638) currently

639)     handle file-sharing traffic load.
640)     </p>

641) 

642)     <p>
643)     For the much more in-depth answer, see <a

644)     href="<blog>why-tor-is-slow">Roger's blog

645)     post on the topic</a>, which includes both a detailed PDF and a
646) video

647)     to go with it.
648)     </p>

649) 

650)     <p>
651)     What can you do to help?
652)     </p>

653) 

654)     <ul>

655) 

656)     <li>

657)     <a href="<page docs/tor-doc-relay>">Configure your Tor to relay
658) traffic
659)     for others</a>. Help make the Tor network large enough that we can
660) handle

661)     all the users who want privacy and security on the Internet.
662)     </li>

663) 

664)     <li>

665)     <a href="<page projects/vidalia>">Help us make Tor more usable</a>.
666) We

667)     especially need people to help make it easier to configure your Tor
668)     as a relay. Also, we need help with clear simple documentation to
669)     walk people through setting it up.
670)     </li>

671) 

672)     <li>

673)     There are some bottlenecks in the current Tor network. Help us
674) design
675)     experiments to track down and demonstrate where the problems are,
676) and

677)     then we can focus better on fixing them.
678)     </li>

679) 

680)     <li>
681)     Tor needs some architectural changes too. One important change is to

682)     start providing <a href="#EverybodyARelay">better service to people
683) who
684)     relay traffic</a>. We're working on this, and we'll finish faster if
685) we

686)     get to spend more time on it.
687)     </li>

688) 

689)     <li>

690)     Help do other things so we can do the hard stuff. Please take a
691) moment
692)     to figure out what your skills and interests are, and then <a
693) href="<page

694)     getinvolved/volunteer>">look at our volunteer page</a>.
695)     </li>

696) 

697)     <li>

698)     Help find sponsors for Tor. Do you work at a company or government
699) agency

700)     that uses Tor or has a use for Internet privacy, e.g. to browse the

701)     competition's websites discreetly, or to connect back to the home
702) servers
703)     when on the road without revealing affiliations? If your
704) organization has
705)     an interest in keeping the Tor network working, please contact them
706) about
707)     supporting Tor. Without sponsors, Tor is going to become even
708) slower.

709)     </li>

710) 

711)     <li>
712)     If you can't help out with any of the above, you can still help out

713)     individually by <a href="<page donate/donate>">donating a bit of
714) money to the

715)     cause</a>. It adds up!
716)     </li>

717) 

718)     </ul>

719) 

720)     <hr>

721) 

722)     <a id="FileSharing"></a>

723)     <h3><a class="anchor" href="#FileSharing">How can I share files

724)     anonymously through Tor?</a></h3>

725) 
726)     <p>

727)     File sharing (peer-to-peer/P2P) is widely unwanted in the Tor network,
728)     and exit nodes are configured to block file sharing traffic by default.
729)     Tor is not really designed for it, and file sharing through Tor slows
730)     down everyone's browsing. Also, Bittorrent over Tor <a

731)     href="https://blog.torproject.org/blog/bittorrent-over-tor-isnt-good-idea">
732)     is not anonymous</a>!

733)     </p>
734) 
735)     <hr>
736) 

737)     <a id="Funding"></a>

738)     <h3><a class="anchor" href="#Funding">What would The Tor Project do
739) with more funding?</a></h3>

740) 

741)     <p>

742)     The Tor network's <a

743) 
744) href="https://metrics.torproject.org/network.html#networksize">several

745)     thousand</a> relays push <a
746)     href="https://metrics.torproject.org/network.html#bandwidth">over
747)     1GB per second on average</a>. We have <a

748) 
749) href="https://metrics.torproject.org/users.html#direct-users">several

750)     hundred thousand daily users</a>. But the Tor network is not yet
751)     self-sustaining.

752)     </p>

753) 

754)     <p>

755)     There are six main development/maintenance pushes that need
756) attention:

757)     </p>

758) 

759)     <ul>

760) 

761)     <li>
762)     Scalability: We need to keep scaling and decentralizing the Tor
763)     architecture so it can handle thousands of relays and millions of

764)     users. The upcoming stable release is a major improvement, but
765) there's

766)     lots more to be done next in terms of keeping Tor fast and stable.
767)     </li>

768) 

769)     <li>

770)     User support: With this many users, a lot of people are asking
771) questions
772)     all the time, offering to help out with things, and so on. We need
773) good
774)     clean docs, and we need to spend some effort coordinating
775) volunteers.

776)     </li>

777) 

778)     <li>

779)     Relay support: the Tor network is run by volunteers, but they still
780) need

781)     attention with prompt bug fixes, explanations when things go wrong,

782)     reminders to upgrade, and so on. The network itself is a commons,
783) and
784)     somebody needs to spend some energy making sure the relay operators
785) stay
786)     happy. We also need to work on stability on some platforms —
787) e.g.,

788)     Tor relays have problems on Win XP currently.

789)     </li>

790) 

791)     <li>

792)     Usability: Beyond documentation, we also need to work on usability
793) of the
794)     software itself. This includes installers, clean GUIs, easy
795) configuration
796)     to interface with other applications, and generally automating all
797) of
798)     the difficult and confusing steps inside Tor. We've got a start on
799) this
800)     with the <a href="<page projects/vidalia>">Vidalia GUI</a>, but much
801) more work

802)     remains — usability for privacy software has never been easy.
803)     </li>

804) 

805)     <li>
806)     Incentives: We need to work on ways to encourage people to configure
807)     their Tors as relays and exit nodes rather than just clients.

808)     <a href="#EverybodyARelay">We need to make it easy to become a
809) relay,

810)     and we need to give people incentives to do it.</a>
811)     </li>

812) 

813)     <li>
814)     Research: The anonymous communications field is full
815)     of surprises and gotchas. In our copious free time, we
816)     also help run top anonymity and privacy conferences like <a
817)     href="http://petsymposium.org/">PETS</a>. We've identified a set of

818)     critical <a href="<page getinvolved/volunteer>#Research">Tor
819) research questions</a>
820)     that will help us figure out how to make Tor secure against the
821) variety of
822)     attacks out there. Of course, there are more research questions
823) waiting

824)     behind these.
825)     </li>

826) 

827)     </ul>

828) 

829)     <p>
830)     We're continuing to move forward on all of these, but at this rate

831)     <a href="#WhySlow">the Tor network is growing faster than the
832) developers

833)     can keep up</a>.

834)     Now would be an excellent time to add a few more developers to the
835) effort

836)     so we can continue to grow the network.
837)     </p>

838) 

839)     <p>
840)     We are also excited about tackling related problems, such as
841)     censorship-resistance.
842)     </p>

843) 

844)     <p>

845)     We are proud to have <a href="<page about/sponsors>">sponsorship and
846) support</a>
847)     from the Omidyar Network, the International Broadcasting Bureau,
848) Bell
849)     Security Solutions, the Electronic Frontier Foundation, several
850) government

851)     agencies and research groups, and hundreds of private contributors.
852)     </p>

853) 

854)     <p>

855)     However, this support is not enough to keep Tor abreast of changes
856) in the
857)     Internet privacy landscape. Please <a href="<page
858) donate/donate>">donate</a>
859)     to the project, or <a href="<page about/contact>">contact</a> our
860) executive

861)     director for information on making grants or major donations.
862)     </p>

863) 

864)     <hr>
865) 
866) 
867)     <a id="Mobile"></a>

868)     <h3><a class="anchor" href="#Mobile">Can I use Tor on my phone or mobile

869)     device?</a></h3>
870) 
871)     <p>

872)     Tor on Android devices is maintained by the <a
873)     href="https://guardianproject.info">Guardian Project</a>. Currently, there
874)     is no supported way of using Tor on iOS; the Guardian Project is

875)     working to make this a reality in the future.
876)     </p>
877) 

878)     <hr>
879) 

880)     <a id="OutboundPorts"></a>
881)     <h3><a class="anchor" href="#OutboundPorts">Which outbound ports must be open when
882)     using Tor as a client?</a></h3>

883)     <p>

884)     Tor may attempt to connect to any port that is advertised in the
885)     directory as an ORPort (for making Tor connections) or a DirPort (for

886)     fetching updates to the directory). There are a variety of these ports:
887)     many of them are running on 80, 443, 9001, and 9030, but many use other
888)     ports too.

889)     </p>
890)     <p>

891)     When using Tor as a client, you could probably get away with opening only those four

892)     ports. Since Tor does all its connections in the background, it will retry
893)     ones that fail, and hopefully you'll never have to know that it failed, as
894)     long as it finds a working one often enough. However, to get the most

895)     diversity in your entry nodes — and thus the most security
896)     — as well as the most robustness in your connectivity, you'll
897)     want to let it connect to all of them.
898)     See the FAQ entry on <a href="#FirewallPorts">firewalled ports</a> if
899)     you want to explicitly tell your Tor client which ports are reachable
900)     for you.
901)     </p>

902) 

903)     <hr>

904) 

905)     <a id="IsItWorking"></a>

906)     <h3><a class="anchor" href="#IsItWorking">How can I tell if Tor is

907)     working, and that my connections really are anonymized?</a></h3>

908) 
909)     <p>

910)     There are sites you can visit that will tell you if you appear to be

911)     coming through the Tor network. Try the <a href="https://check.torproject.org">
912)     Tor Check</a> site and see whether it thinks you are using Tor or not.

913)     </p>

914) 

915)     <hr>

916) 

917)     <a id="FTP"></a>
918)     <h3><a class="anchor" href="#FTP">How do I use my browser for ftp with Tor?
919)     </a></h3>
920) 

921)     <p>

922)     Use <a href="https://torproject.org/projects/torbrowser.html">Tor
923)     Browser</a>. If you want a separate application for an

924)     ftp client, we've heard good things about  FileZilla for Windows. You can
925)     configure it to point to Tor as a "socks4a" proxy on "localhost" port
926)     "9050".

927)     </p>

928) 

929)     <hr>

930) 

931)     <a id="NoDataScrubbing"></a>

932)     <h3><a class="anchor" href="#NoDataScrubbing">Does Tor remove personal

933)     information from the data my application sends?</a></h3>
934) 

935)     <p>No, it doesn't. You need to use a separate program that understands
936)     your application and protocol and knows how to clean or "scrub" the data

937)     it sends. The Tor Browser tries to keep application-level data,

938)     like the user-agent string, uniform for all users. The Tor Browser can't
939)     do anything about text that you type into forms, though. <a

940)     href="<page download/download-easy>#warning">Be

941)     careful and be smart.</a>
942)     </p>
943) 
944)     <hr>
945) 

946)     <a id="Metrics"></a>

947)     <h3><a class="anchor" href="#Metrics">How many people use Tor? How

948)     many relays or exit nodes are there?</a></h3>

949) 

950)     <p>
951)     All this and more about measuring Tor can be found at the <a

952)     href="https://metrics.torproject.org/">Tor Metrics Portal</a>.</p>

953)     <hr>

954) 

955)     <a id="SSLcertfingerprint"></a>

956)     <h3><a class="anchor" href="#SSLcertfingerprint">What are the SSL

957)     certificate fingerprints for Tor's various websites?</a></h3>

958)     <p>

959)     *.torproject.org SSL certificate from Digicert:

960)     </p>
961)     <pre>
962) Issued Certificate
963) Version: 3
964) Serial Number: 09 48 B1 A9 3B 25 1D 0D B1 05 10 59 E2 C2 68 0A
965) Not Valid Before: 2013-10-22
966) Not Valid After: 2016-05-03
967) Certificate Fingerprints
968) SHA1: 84 24 56 56 8E D7 90 43 47 AA 89 AB 77 7D A4 94 3B A1 A7 D5
969) MD5: A4 16 66 80 AE B9 A4 EC AA 88 01 1B 6F B9 EB CB

970)     </pre>

971) <br>
972)     <p>
973) blog.torproject.org SSL certificate from RapidSSL:

974)     </p>

975)     <pre>
976) Issued Certificate
977) Version: 3
978) Serial Number: 05 CA 2A A9 A5 D6 ED 44 C7 2D 88 1A 18 B0 E7 DC
979) Not Valid Before: 2014-04-09
980) Not Valid After: 2017-06-14
981) Certificate Fingerprints
982) SHA1: DE 20 3D 46 FD C3 68 EB BA 40 56 39 F5 FA FD F5 4E 3A 1F 83
983) MD5: 8A 8A A2 5E D9 7F 84 4C 8F 00 3B 43 E0 2D E6 4D
984)     </pre>

985)     <hr>
986) 

987)     <a id="CompilationAndInstallation"></a>
988)     <h2><a class="anchor">Compilation And Installation:</a></h2>
989) 

990)     <a id="HowUninstallTor"></a>

991)     <h3><a class="anchor" href="#HowUninstallTor">How do I uninstall
992) Tor?</a></h3>
993) 
994)     <p>
995)     Tor Browser does not install itself in the classic sense of
996) applications. You just simply delete the folder or directory named "Tor
997) Browser" and it is removed from your system.
998)     </p>

999) 

1000)     <p>

1001)     If this is not related to Tor Browser, uninstallation depends
1002) entirely on how you installed it and which operating system you
1003)     have. If you installed a package, then hopefully your package has a
1004) way to

1005)     uninstall itself. The Windows packages include uninstallers.

1006)     </p>

1007) 

1008)     <p>
1009)     For Mac OS X, follow the <a
1010)     href="<page docs/tor-doc-osx>#uninstall">uninstall directions</a>.
1011)     </p>

1012) 

1013)     <p>

1014)     If you installed by source, I'm afraid there is no easy uninstall
1015) method. But
1016)     on the bright side, by default it only installs into /usr/local/ and
1017) it should

1018)     be pretty easy to notice things there.
1019)     </p>

1020) 

1021)     <hr>

1022) 

1023)     <a id="PGPSigs"></a>

1024)     <h3><a class="anchor" href="#PGPSigs">What are these "sig" files on
1025) the download page?</a></h3>

1026) 

1027)     <p>

1028)     These are PGP signatures, so you can verify that the file you've
1029) downloaded is

1030)     exactly the one that we intended you to get.
1031)     </p>

1032) 

1033)     <p>
1034)     Please read the <a

1035)     href="<page docs/verifying-signatures>">verifying signatures</a>
1036) page for details.

1037)     </p>

1038) 

1039) <hr>
1040) 
1041) <a id="GetTor"></a>
1042) <h3><a class="anchor" href="#GetTor">Your website is blocked in my
1043) country. How do I download Tor?</a></h3>
1044) 
1045) <p>
1046) Some government or corporate firewalls censor connections to Tor's
1047) website. In those cases, you have three options. First, get it from

1048) a friend &mdash; <a href="<page projects/torbrowser>">Tor Browser</a> 
1049) fits nicely on a USB key. Second, find the <a

1050) href="https://encrypted.google.com/search?q=tor+mirrors">google
1051) cache</a>

1052) for the <a href="<page getinvolved/mirrors>">Tor mirrors</a> page
1053) and see if any of those copies of our website work for you. Third,
1054) you can download Tor via email: log in to your Gmail account and mail

1055) '<tt>gettor@gettor.torproject.org</tt>'. If you include the word 'help'

1056) in the body of the email, it will reply with instructions. Note that
1057) only a few webmail providers are supported, since they need to be able
1058) to receive very large attachments.
1059) </p>
1060) 
1061) <p>

1062) Be sure to <a href="<page docs/verifying-signatures>">verify the
1063) signature</a>

1064) of any package you download, especially when you get it from somewhere
1065) other than our official HTTPS website.

1066) </p>
1067) 

1068)     <hr>

1069) 

1070)     <a id="VirusFalsePositives"></a>

1071)     <h3><a class="anchor" href="#VirusFalsePositives">Why does my
1072)     Tor executable appear to have a virus or spyware?</a></h3>

1073)     <p>

1074)     Sometimes, overzealous Windows virus and spyware detectors trigger on
1075)     some parts of the Tor Windows binary. Our best guess is that these are
1076)     false positives — after all, the anti-virus and anti-spyware business is
1077)     just a guessing game anyway. You should contact your vendor and explain
1078)     that you have a program that seems to be triggering false positives. Or

1079)     pick a better vendor.
1080)     </p>

1081)     <p>In the meantime, we encourage you to not just take our word for it.
1082)     Our job is to provide the source; if you're concerned, please do

1083)     recompile it yourself.</p>
1084) 
1085)     <hr>
1086) 

1087)     <a id="tarballs"></a>

1088)     <h3><a class="anchor" href="#tarballs">How do I open a .tar.gz

1089)     or .tar.xz file?</a></h3>

1090) 
1091)     <p>
1092)     Tar is a common archive utility for Unix and Linux systems. If your

1093)     system has a mouse, you can usually open them by double clicking.
1094)     Otherwise open a command prompt and execute</p>

1095)     <pre>tar xzf &lt;FILENAME&gt;.tar.gz</pre> or <pre>tar xJf &lt;FILENAME&gt;.tar.xz</pre>

1096)     <p>

1097)     as documented on tar's man page.

1098)     </p>
1099) 
1100)     <hr>
1101) 

1102)     <a id="LiveCD"></a>

1103)     <h3><a class="anchor" href="#LiveCD">Is there a LiveCD or other
1104) bundle that includes Tor?</a></h3>

1105) 

1106)     <p>

1107)     Yes.  Use <a href="https://tails.boum.org/">The Amnesic Incognito

1108)     Live System</a> or <a href="<page projects/torbrowser>">Tor Browser</a>.

1109)     </p>

1110) 
1111) <hr>
1112) 

1113) <a id="TBBGeneral"></a>

1114) <h2><a class="anchor">Tor Browser (general):</a></h2>

1115) 

1116) <a id="TBBFlash"></a>

1117) <h3><a class="anchor" href="#TBBFlash">Why can't I view videos on
1118) YouTube

1119) and other Flash-based sites?</a></h3>

1120) 
1121) <p>

1122) YouTube and similar sites require third party browser plugins such as Flash.
1123) Plugins operate independently from Firefox and can perform
1124) activity on your computer that ruins your anonymity. This includes
1125) but is not limited to: <a href="http://decloak.net">completely disregarding
1126) proxy settings</a>, querying your <a

1127) href="http://forums.sun.com/thread.jspa?threadID=5162138&messageID=9618376">
1128) local IP address</a>, and <a

1129) href="http://epic.org/privacy/cookies/flash.html">storing their own
1130) cookies</a>. It is possible to use a LiveCD solution such as

1131) or <a href="https://tails.boum.org/">The Amnesic Incognito Live System</a>
1132) that creates a secure, transparent proxy to protect you from proxy bypass,
1133) however issues with local IP address discovery and Flash cookies still remain.

1134) </p>

1135) 
1136) <p>

1137) <a href="https://www.youtube.com/html5">YouTube offers experimental HTML5 video

1138) support</a> for many of their videos. Often you can get the HTML5 version of
1139) videos that don't want to play by grabbing the YouTube URL from the "Embed"

1140) code under a video's "Share" option. The link switches out a URL that looks</p>
1141) <pre>https://www.youtube.com/watch?v=CJNxbpbHA-I</pre>
1142) <p>to something that looks like</p>
1143) <pre>https://www.youtube.com/embed/CJNxbpbHA-I</pre>

1144) 

1145) <hr>
1146) 

1147) <a id="Ubuntu"></a>
1148) <h3><a class="anchor" href="#Ubuntu">

1149) I'm using Ubuntu and I can't start Tor Browser.</a></h3>

1150) <p>

1151) You'll need to tell Ubuntu that you want the ability to execute shell scripts
1152) from the graphical interface. Open "Files" (Unity's explorer), open
1153) Preferences-> Behavior Tab -> Set "Run executable text files when they are

1154) opened" to "Ask every time", then OK.

1155) </p>
1156) <p>You can also start the Tor Browser from the command line by running </p>

1157) <pre>./start-tor-browser</pre>

1158) <p>
1159) from inside the Tor Browser directory.
1160) </p>
1161) 

1162) <hr>
1163) 

1164) <a id="SophosOnMac"></a>
1165) <h3><a class="anchor" href="#SophosOnMac">I'm using the Sophos anti-virus

1166)     software on my Mac, and Tor starts but I can't browse anywhere.</a></h3>

1167) <p>

1168) You'll need to modify Sophos anti-virus so that Tor can connect to the
1169) internet. Go to Preferences -> Web Protection -> General, and turn off

1170) the protections for "Malicious websites" and "Malicious downloads".
1171) </p>

1172) <p>

1173) We encourage affected Sophos users to contact Sophos support about

1174) this issue.
1175) </p>

1176) 

1177) <hr>
1178) 

1179) <a id="XPCOMError"></a>

1180) <h3><a class="anchor" href="#XPCOMError">When I start Tor Browser I get an 
1181) error message: "Cannot load XPCOM".</a></h3>

1182) 
1183) <p>

1184) This <a 
1185) href="https://trac.torproject.org/projects/tor/ticket/10789">problem</a> is 
1186) specifically caused by the Webroot SecureAnywhere Antivirus software. 
1187) From the Webroot control panel, go to Identity Protection &rarr; Application 
1188) Protection, and set all the files in your Tor Browser folder to 'Allow'. 
1189) We encourage affected Webroot users to contact Webroot support about this 
1190) issue.

1191) </p>

1192) 
1193) <hr>
1194) 

1195) <a id="TBBOtherExtensions"></a>
1196) <h3><a class="anchor" href="#TBBOtherExtensions">Can I install other
1197) Firefox extensions?</a></h3>
1198) 
1199) <p>

1200) The Tor Browser is free software, so there is nothing preventing you from
1201) modifying it any way you like. However, we do not recommend installing any

1202) additional Firefox add-ons with Tor Browser. Add-ons can break

1203) your anonymity in a number of ways, including browser fingerprinting and

1204) bypassing proxy settings.

1205) </p>

1206) <p>

1207) Some people have suggested we include ad-blocking software or

1208) anti-tracking software with the Tor Browser. Right now, we do not
1209) think that's such a good idea. Tor Browser aims to provide

1210) sufficient privacy that additional add-ons to stop ads and trackers are
1211) not necessary. Using add-ons like these may cause some sites to break, which

1212) <a href="https://www.torproject.org/projects/torbrowser/design/#philosophy">

1213) we don't want to do</a>. Additionally, maintaining a list of "bad" sites that
1214) should be black-listed provides another opportunity to uniquely fingerprint
1215) users.

1216) </p>

1217) 

1218) <hr>
1219) 

1220) <a id="TBBJavaScriptEnabled"></a>

1221) <a id="TBBCanIBlockJS"></a>

1222) <h3><a class="anchor" href="#TBBJavaScriptEnabled">Why is NoScript

1223) configured to allow JavaScript by default in Tor Browser?

1224) Isn't that unsafe?</a></h3>

1225) 
1226) <p>

1227) We configure NoScript to allow JavaScript by default in Tor
1228) Browser because many websites will not work with JavaScript

1229) disabled.  Most users would give up on Tor entirely if a website
1230) they want to use requires JavaScript, because they would not know
1231) how to allow a website to use JavaScript (or that enabling
1232) JavaScript might make a website work).
1233) </p>
1234) 

1235) <p>
1236) There's a tradeoff here. On the one hand, we should leave
1237) JavaScript enabled by default so websites work the way
1238) users expect. On the other hand, we should disable JavaScript
1239) by default to better protect against browser vulnerabilities (<a

1240) href="https://blog.torproject.org/blog/tor-security-advisory-old-tor-browser-bundles-vulnerable">
1241) not just a theoretical concern!</a>). But there's a third issue: websites

1242) can easily determine whether you have allowed JavaScript for them,
1243) and if you disable JavaScript by default but then allow a few websites
1244) to run scripts (the way most people use NoScript), then your choice of
1245) whitelisted websites acts as a sort of cookie that makes you recognizable
1246) (and distinguishable), thus harming your anonymity.
1247) </p>

1248) 
1249) <p>

1250) Ultimately, we want the default Tor bundles to use
1251) a combination of firewalls (like the iptables rules
1252) in <a href="https://tails.boum.org/">Tails</a>) and <a
1253) href="https://trac.torproject.org/projects/tor/ticket/7680">sandboxes</a>
1254) to make JavaScript not so scary. In
1255) the shorter term, TBB 3.0 will hopefully <a
1256) href="https://trac.torproject.org/projects/tor/ticket/9387">allow users
1257) to choose their JavaScript settings more easily</a> &mdash; but the
1258) partitioning concern will remain.

1259) </p>
1260) 
1261) <p>

1262) Until we get there, feel free to leave JavaScript on or off depending
1263) on your security, anonymity, and usability priorities.

1264) </p>
1265) 
1266) <hr>
1267) 

1268) <a id="TBBOtherBrowser"></a>
1269) <h3><a class="anchor" href="#TBBOtherBrowser">I want to use
1270) Chrome/IE/Opera/etc with Tor.</a></h3>
1271) 
1272) <p>

1273) In short, using any browser besides Tor Browser with Tor is a

1274) really bad idea.
1275) </p>
1276) 
1277) <p>

1278) Our efforts to work with the Chrome team to <a
1279) href="https://blog.torproject.org/blog/google-chrome-incognito-mode-tor-and-fingerprinting">add
1280) missing APIs</a> were unsuccessful, unfortunately. Currently, it is impossible
1281) to use other browsers and get the same level of protections as when using the
1282) Tor Browser.

1283) </p>
1284) 
1285) <hr>
1286) 

1287) <a id="GoogleCAPTCHA"></a>
1288) <h3><a class="anchor" href="#GoogleCAPTCHA">Google makes me solve a
1289) CAPTCHA or tells me I have spyware installed.</a></h3>

1290) 
1291) <p>
1292) This is a known and intermittent problem; it does not mean that Google
1293) considers Tor to be spyware.
1294) </p>
1295) 
1296) <p>

1297) When you use Tor, you are sending queries through exit relays that are

1298) also shared by thousands of other users. Tor users typically see this
1299) message when many Tor users are querying Google in a short period of time.
1300) Google interprets the high volume of traffic from a single IP address
1301) (the exit relay you happened to pick) as somebody trying to "crawl" their
1302) website, so it slows down traffic from that IP address for a short time.

1303) </p>
1304) <p>
1305) An alternate explanation is that Google tries to detect certain
1306) kinds of spyware or viruses that send distinctive queries to Google
1307) Search. It notes the IP addresses from which those queries are received
1308) (not realizing that they are Tor exit relays), and tries to warn any
1309) connections coming from those IP addresses that recent queries indicate
1310) an infection.
1311) </p>
1312) 
1313) <p>

1314) To our knowledge, Google is not doing anything intentionally specifically

1315) to deter or block Tor use. The error message about an infected machine
1316) should clear up again after a short time.
1317) </p>
1318) 
1319) <hr />
1320) 

1321) <a id="ForeignLanguages"></a>
1322) <h3><a class="anchor" href="#ForeignLanguages">
1323) Why does Google show up in foreign languages?</a></h3>
1324) 
1325) <p>

1326)  Google uses "geolocation" to determine where in the world you are, so it
1327)  can give you a personalized experience. This includes using the language
1328)  it thinks you prefer, and it also includes giving you different results

1329)  on your queries.

1330) </p>
1331) <p>

1332) If you really want to see Google in English you can click the link that
1333) provides that. But we consider this a feature with Tor, not a bug --- the
1334) Internet is not flat, and it in fact does look different depending on

1335) where you are. This feature reminds people of this fact.

1336) </p>
1337) <p>

1338) Note that Google search URLs take name/value pairs as arguments and one
1339) of those names is "hl". If you set "hl" to "en" then Google will return
1340) search results in English regardless of what Google server you have been
1341) sent to. On a query this looks like:

1342) </p>

1343) <pre>https://encrypted.google.com/search?q=online%20anonymity&hl=en</pre>

1344) <p>

1345) Another method is to simply use your country code for accessing Google.
1346) This can be google.be, google.de, google.us and so on.

1347) </p>
1348) <hr />

1349) <a id="GmailWarning"></a>

1350) <h3><a class="anchor" href="#GmailWarning">Gmail warns me that my

1351) account may have been compromised.</a></h3>

1352) 
1353) <p>
1354) Sometimes, after you've used Gmail over Tor, Google presents a
1355) pop-up notification that your account may have been compromised.
1356) The notification window lists a series of IP addresses and locations
1357) throughout the world recently used to access your account.
1358) </p>
1359) 
1360) <p>
1361) In general this is a false alarm: Google saw a bunch of logins from

1362) different places, as a result of running the service via Tor, and
1363) decided

1364) it was a good idea to confirm the account was being accessed by it's
1365) rightful owner.
1366) </p>
1367) 
1368) <p>
1369) Even though this may be a biproduct of using the service via tor,
1370) that doesn't mean you can entirely ignore the warning. It is
1371) <i>probably</i> a false positive, but it might not be since it is
1372) possible for someone to hijack your Google cookie.
1373) </p>
1374) 
1375) <p>
1376) Cookie hijacking is possible by either physical access to your computer
1377) or by watching your network traffic.  In theory only physical access
1378) should compromise your system because Gmail and similar services
1379) should only send the cookie over an SSL link. In practice, alas, it's <a

1380) href="http://fscked.org/blog/fully-automated-active-https-cookie-
1381) hijacking">

1382) way more complex than that</a>.
1383) </p>
1384) 
1385) <p>
1386) And if somebody <i>did</i> steal your google cookie, they might end
1387) up logging in from unusual places (though of course they also might
1388) not). So the summary is that since you're using Tor, this security
1389) measure that Google uses isn't so useful for you, because it's full of
1390) false positives. You'll have to use other approaches, like seeing if
1391) anything looks weird on the account, or looking at the timestamps for
1392) recent logins and wondering if you actually logged in at those times.
1393) </p>
1394) 
1395) <hr>
1396) 

1397) <a id="NeedToUseAProxy"></a>

1398) <h3><a class="anchor" href="#NeedToUseAProxy">My internet connection

1399) requires an HTTP or SOCKS Proxy</a></h3>

1400) 
1401) <p>

1402) You can set Proxy IP address, port, and authentication information in
1403) Tor Browser's Network Settings. If you're using Tor another way, check
1404) out the HTTPProxy and HTTPSProxy config options in the <a

1405) href="<page docs/tor-manual>">man page</a>,

1406) and modify your torrc file accordingly. You will need an HTTP proxy for
1407) doing GET requests to fetch the Tor directory, and you will need an
1408) HTTPS proxy for doing CONNECT requests to get to Tor relays. (It's fine
1409) if they're the same proxy.) Tor also recognizes the torrc options
1410) Socks4Proxy and Socks5Proxy.

1411) </p>
1412) <p>

1413) Also read up on the HTTPProxyAuthenticator and HTTPSProxyAuthenticator
1414) options if your proxy requires auth. We only support basic auth currently,
1415) but if you need NTLM authentication, you may find <a
1416) href="http://archives.seul.org/or/talk/Jun-2005/msg00223.html">this post
1417) in the archives</a> useful.

1418) </p>
1419) <p>

1420) If your proxies only allow you to connect to certain ports, look at the
1421) entry on <a href="#FirewallPorts">Firewalled clients</a> for how
1422) to restrict what ports your Tor will try to access.

1423) </p>
1424) 
1425) <hr>
1426) 

1427) 
1428) <a id="TBBSocksPort"></a>
1429) <h3><a class="anchor" href="#TBBSocksPort">
1430) I want to run another application through Tor.</a></h3>
1431) 
1432) <p>
1433) If you are trying to use some external application with Tor, step zero
1434) should be to <a href="<page download/download>#warning">reread the set
1435) of warnings</a> for ways you can screw up. Step one should be to try
1436) to use a SOCKS proxy rather than an HTTP proxy.
1437) Typically Tor listens for SOCKS connections on port 9050. Tor Browser listens
1438) on port 9150.
1439) </p>
1440) 
1441) <p>
1442) If your application doesn't support SOCKS proxies, feel free to install <a
1443) href="http://www.privoxy.org/">privoxy</a>.
1444) However, please realize that this approach is not recommended for novice
1445) users. Privoxy has an <a
1446) href="http://www.privoxy.org/faq/misc.html#TOR">example
1447) configuration</a> of Tor and Privoxy.
1448) </p>
1449) 
1450) <p>

1451) If you're unable to use the application's native proxy settings, all hope is

1452) not lost. See <a href="#CantSetProxy">below</a>.
1453) </p>
1454) 
1455) <hr>
1456) 

1457) <a id="CantSetProxy"></a>

1458) <h3><a class="anchor" href="#CantSetProxy">What should I do if I can't

1459) set a proxy with my application?</a></h3>
1460) 
1461) <p>

1462) On Unix, we recommend you give <a
1463) href="https://github.com/dgoulet/torsocks/">torsocks</a> a try.
1464) Alternative proxifying tools like <a
1465) href="http://www.dest-unreach.org/socat/">socat</a> and <a
1466) href="http://proxychains.sourceforge.net/">proxychains</a> are also

1467) available.</p>

1468) <p>
1469) The Windows way to force applications through Tor is less clear. <a
1470) href="http://freecap.ru/eng/">Some</a> <a
1471) href="http://www.freehaven.net/~aphex/torcap/">tools</a> have been <a

1472) href="http://www.crowdstrike.com/community-tools/index.html#tool-79">proposed

1473) </a>, but we'd also like to see further testing done here.

1474) </p>
1475) 
1476) <hr>
1477) 

1478) <a id="TBB3.x"></a>

1479) <h2><a class="anchor">Tor Browser (3.x and later):</a></h2>

1480)     <a id="WhereDidVidaliaGo"></a>

1481)     <h3><a class="anchor" href="#WhereDidVidaliaGo">Where did the world map

1482)     (Vidalia) go?</a></h3>
1483) 

1484)     <p>Vidalia has been replaced with Tor Launcher, which is a Firefox
1485)     extension that provides similar functionality. Unfortunately, circuit
1486)     status reporting is still missing, but we are <a
1487)     href="https://trac.torproject.org/projects/tor/ticket/8641">working

1488)     on providing it</a>. </p>
1489) 

1490)     <p>In the meantime, we are providing standalone Vidalia packages for
1491)     people who still want the map. Windows and Linux versions are <a

1492)     href="https://people.torproject.org/~erinn/vidalia-standalone-bundles/">

1493)     available here</a>.</p>

1494) 

1495)     <p>To use these packages, extract them, then run the startup script.
1496)     On Windows, this is "Start Vidalia.exe". On Linux, it is start-vidalia.
1497)     They can be placed in a different directory from TBB (and likely should

1498)     be). </p>
1499) 

1500)     <p>This Vidalia package will only run properly if Tor Browser has already

1501)     been launched. You cannot start it before launching Tor Browser. </p>
1502) 

1503)     <p>MacOS is still under development, but in the mean time you can modify
1504)     your TBB 2.x to be a standalone Vidalia (and then use it after starting
1505)     TBB 3.x) by opening your TBB 2.x vidalia.conf file in an editor and

1506)     replacing its contents with just these lines:</p>
1507) 
1508)     <pre>
1509)     [General]
1510)     LanguageCode=en
1511) 
1512)     [Tor]
1513)     ControlPort=9151
1514)     TorExecutable=.
1515)     Torrc=.
1516)     DataDirectory=.
1517)     AuthenticationMethod=cookie

1518)     </pre>

1519) 
1520)     <hr>
1521) 
1522)     <a id="DisableJS"></a>
1523)     <h3><a class="anchor" href="#DisableJS">How do I disable JavaScript?</a>
1524)     </h3>
1525) 

1526)     <p>Alas, Mozilla decided to get rid of the config checkbox for JavaScript
1527)     from earlier Firefox versions. And since TBB 3.5 is based on Firefox 24
1528)     (FF17 is unmaintained), that means TBB 3.5 doesn't have the config

1529)     checkbox anymore either, which is unfortunate.</p>
1530) 

1531)     <p>The simplest way to disable JavaScript in TBB 3.5 is to click on the
1532)     Noscript "S" (between the green onion and the address bar), and select
1533)     "Forbid scripts globally". Note that vanilla NoScript actually whitelists
1534)     several domains even when you try to disable scripts globally, whereas

1535)     Tor Browser's NoScript configuration disables all of them. </p>
1536) 

1537)     <p>The more klunky way to disable JavaScript is to go to about:config,

1538)     find javascript.enabled, and set it to false.</p>
1539) 
1540)     <p>There is also a very simple addon available at addons.mozilla.org
1541)     called QuickJS, which provides a toolbar toggle for the javascript.enabled

1542)     about:config control. There are no configuration options for the addon,
1543)     it just switches the javascript.enabled entry between true and false and

1544)     provides a button for it. </p>
1545) 

1546)     <p>If you want to be extra safe, use both the about:config setting and

1547)     NoScript. </p>
1548) 

1549)     <p>As for whether you should disable it or leave it enabled, that's <a

1550)     href="#TBBJavaScriptEnabled">a tradeoff we leave to you</a>.</p>

1551) 
1552)     <hr>
1553) 
1554)     <a id="VerifyDownload"></a>
1555)     <h3><a class="anchor" href="#VerifyDownload">How do I verify the download
1556)     (sha256sums.txt)?</a></h3>
1557) 

1558)     <p>Instructions are on the <a
1559)     href="<page docs/verifying-signatures>#BuildVerification">verifying

1560)     signatures</a> page.</p>

1561) 
1562)     <hr>

1563) 

1564)     <a id="NewIdentityClosingTabs"></a>

1565)     <h3><a class="anchor" href="#NewIdentityClosingTabs">Why does "New

1566)     Identity" close all my open tabs?</a></h3>
1567) 
1568)     <p>

1569)     That's actually a feature, since it's discarding your application-level
1570)     browser data too. But it sure is a surprising feature, for people who

1571)     are used to Vidalia's "new identity" behavior.
1572)     </p>
1573) 
1574)     <p>

1575)     We're working on ways to make the behavior less surprising, e.g. a popup
1576)     warning or auto restoring tabs. See ticket <a
1577)     href="https://trac.torproject.org/projects/tor/ticket/9906">#9906</a> and
1578)     ticket <a
1579)     href="https://trac.torproject.org/projects/tor/ticket/10400">#10400</a>
1580)     to follow progress there.

1581)     </p>
1582) 
1583)     <p>

1584)     In the mean time, you can get Vidalia's old "newnym" functionality by
1585)     attaching a Vidalia to your TBB 3.x. See the instructions <a
1586)     href="#WhereDidVidaliaGo">above</a>.

1587)     </p>
1588) 
1589)     <hr>
1590) 
1591)     <a id="ConfigureRelayOrBridge"></a>
1592)     <h3><a class="anchor" href="#ConfigureRelayOrBridge">How do I configure Tor as a relay or bridge?</a></h3>
1593) 
1594)     <p>

1595)     You've got three options.

1596)     </p>
1597) 
1598)     <p>

1599)     First (best option), if you're on Linux, you can install the system
1600)     Tor package (e.g. apt-get install tor) and then set it up to be a relay
1601)     (<a href="https://www.torproject.org/docs/tor-relay-debian">instructions</a>).

1602)     You can then use TBB independent of that.
1603)     </p>
1604) 
1605)     <p>

1606)     Second (simpler option), if you're on Windows, you can fetch the separate
1607)     "Vidalia relay bundle" or "Vidalia bridge bundle" from the download page
1608)     and then use that (again you can use TBB independent of it).

1609)     </p>
1610) 
1611)     <p>

1612)     Third (complex option), you can either hook your Vidalia up to TBB (as
1613)     described in the FAQ above) or edit your torrc file (in Data/Tor/torrc)
1614)     directly to add the following lines:

1615)     </p>
1616)     <pre>
1617)     ORPort 443
1618)     Exitpolicy reject *:*
1619)     BridgeRelay 1  # only add this line if you want to be a bridge
1620)     </pre>
1621)     <p>

1622)     If you've installed <a

1623)     href="<page projects/obfsproxy-debian-instructions>#instructions">Obfsproxy</a>,

1624)     you'll need to add one more line:
1625)     </p>
1626)     <pre>
1627)     ServerTransportPlugin obfs3 exec /usr/bin/obfsproxy managed
1628)     </pre>
1629)     <p>

1630)     This third option is pretty klunky right now; see e.g. <a
1631)     href="https://trac.torproject.org/projects/tor/ticket/10449">this bug</a>;
1632)     but we're hoping it will become an easy option in the future.

1633)     </p>
1634) 
1635)     <hr>
1636) 
1637)     <a id="Timestamps"></a>

1638)     <h3><a class="anchor" href="#Timestamps">Why are the file timestamps

1639)     from 2000?</a></h3>
1640) 

1641)     <p>One of the huge new features in TBB 3.x is the "deterministic build"

1642)     process, which allows many people to build Tor Browser and

1643)     verify that they all make exactly the same package. See Mike's <a
1644)     href="https://blog.torproject.org/blog/deterministic-builds-part-one-cyberwar-and-global-compromise">first
1645)     blog</a> post for the motivation, and his <a

1646)     href="https://blog.torproject.org/blog/deterministic-builds-part-two-technical-details">second

1647)     blog post</a> for the technical details of how we do it.

1648)     </p>
1649) 

1650)     <p>Part of creating identical builds is having everybody use the same
1651)     timestamp. Mike picked the beginning of 2000 for that time. The reason

1652)     you might see 7pm in 1999 is because of time zones. </p>
1653) 
1654)     <hr>
1655) 

1656)     <a id="TBBSourceCode"></a>

1657)     <h3><a class="anchor" href="#TBBSourceCode">Where is the source code for 
1658)     Tor Browser? How do I verify a build?</a></h3>

1659) 
1660)     <p>

1661)     Start with <a href="https://gitweb.torproject.org/builders/tor-browser-bundle.git">https://gitweb.torproject.org/builders/tor-browser-bundle.git</a> and <a href="https://gitweb.torproject.org/builders/tor-browser-bundle.git/tree/gitian/README.build">https://gitweb.torproject.org/builders/tor-browser-bundle.git/tree/gitian/README.build</a>.

1662)     </p>
1663) 
1664) 

1665) <hr>
1666) 

1667) <a id="AdvancedTorUsage"></a>
1668) <h2><a class="anchor">Advanced Tor usage:</a></h2>
1669) 

1670) <a id="torrc"></a>

1671) <h3><a class="anchor" href="#torrc">I'm supposed to "edit my torrc".
1672) What does that mean?</a></h3>

1673) 
1674) <p>
1675) Tor installs a text file called torrc that contains configuration
1676) instructions for how your Tor program should behave. The default

1677) configuration should work fine for most Tor users.

1678) </p>

1679) <p>

1680) If you installed Tor Browser, look for
1681) <code>Data/Tor/torrc</code> inside your Tor Browser directory.
1682) On OS X, you must right-click or command-click on the Tor Browser icon,

1683) and select "Show Package Contents" before the Tor Browser directories become
1684) visible.

1685) </p>
1686) <p>

1687) Tor puts the torrc file in <code>/usr/local/etc/tor/torrc</code> if you compiled tor from source, and <code>/etc/tor/torrc</code> or <code>/etc/torrc</code> if you installed a pre-built package.</p>

1688) 
1689) <p>

1690) Once you've changed your torrc, you will need to restart tor for the
1691) changes to take effect. (For advanced users, note that

1692) you actually only need to send Tor a HUP signal, not actually restart
1693) it.)

1694) </p>
1695) 
1696) <p>

1697) For other configuration options you can use, see the <a href="<page

1698) docs/tor-manual>">Tor manual page</a>. Have a look at <a

1699) href="https://gitweb.torproject.org/tor.git/tree/src/config/torrc.sample.in">

1700) the sample torrc file</a> for hints on common configurations. Remember, all
1701) lines beginning with # in torrc are treated as comments and have no effect

1702) on Tor's configuration.

1703) </p>
1704) 
1705) <hr>
1706) 

1707) <a id="Logs"></a>

1708) <h3><a class="anchor" href="#Logs">How do I set up logging, or see Tor's
1709) logs?</a></h3>

1710) 
1711) <p>

1712) If you installed a Tor bundle that includes Vidalia, then Vidalia has a

1713) window called "Message Log" that will show you Tor's log messages. Click
1714) on "Advanced" to see more details. You can click on "Settings" to change
1715) your log verbosity or save the messages to a file. You're all set.

1716) </p>
1717) 
1718) <p>
1719) If you're not using Vidalia, you'll have to go find the log files by

1720) hand. Here are some likely places for your logs to be:

1721) </p>
1722) 
1723) <ul>
1724) <li>On OS X, Debian, Red Hat, etc, the logs are in /var/log/tor/
1725) </li>

1726) <li>On Windows, there are no default log files currently. If you enable
1727) logs in your torrc file, they default to <code>\username\Application
1728) Data\tor\log\</code> or <code>\Application Data\tor\log\</code>
1729) </li>
1730) <li>If you compiled Tor from source, by default your Tor logs to <a
1731) href="http://en.wikipedia.org/wiki/Standard_streams">"stdout"</a>
1732) at log-level notice. If you enable logs in your torrc file, they
1733) default to <code>/usr/local/var/log/tor/</code>.

1734) </li>
1735) </ul>
1736) 
1737) <p>

1738) To change your logging setup by hand, <a href="#torrc">edit your
1739) torrc</a>

1740) and find the section (near the top of the file) which contains the
1741) following line:

1742) </p>
1743) 
1744) <pre>

1745) \## Logs go to stdout at level "notice" unless redirected by something
1746) \## else, like one of the below lines.

1747) </pre>

1748) 
1749) <p>

1750) For example, if you want Tor to send complete debug, info, notice, warn,

1751) and err level messages to a file, append the following line to the end
1752) of the section:
1753) </p>
1754) 
1755) <pre>
1756) Log debug file c:/program files/tor/debug.log
1757) </pre>
1758) 
1759) <p>

1760) Replace <code>c:/program files/tor/debug.log</code> with a directory
1761) and filename for your Tor log.

1762) </p>
1763) 
1764) <hr>
1765) 

1766) 
1767) <a id="LogLevel"></a>
1768) <h3><a class="anchor" href="#LogLevel">What log level should I use?</a></h3>
1769) 
1770) <p>

1771) There are five log levels (also called "log severities") you might see in

1772) Tor's logs:

1773) </p>
1774) 
1775) <ul>

1776)     <li>"err": something bad just happened, and we can't recover. Tor will

1777)     exit.</li>

1778)     <li>"warn": something bad happened, but we're still running. The bad
1779)     thing might be a bug in the code, some other Tor process doing something
1780)     unexpected, etc. The operator should examine the message and try to

1781)     correct the problem.</li>

1782)     <li>"notice": something the operator will want to know about.</li>

1783)     <li>"info": something happened (maybe bad, maybe ok), but there's

1784)     nothing you need to (or can) do about it.</li>

1785)     <li>"debug": for everything louder than info. It is quite loud indeed.</li>

1786) </ul>
1787) 
1788) <p>

1789) Alas, some of the warn messages are hard for ordinary users to correct -- the
1790) developers are slowly making progress at making Tor automatically react

1791) correctly for each situation.

1792) </p>
1793) 
1794) <p>

1795) We recommend running at the default, which is "notice". You will hear about

1796) important things, and you won't hear about unimportant things.

1797) </p>
1798) 
1799) <p>

1800) Tor relays in particular should avoid logging at info or debug in normal
1801) operation, since they might end up recording sensitive information in
1802) their logs.

1803) </p>
1804) 

1805) <hr>
1806) 

1807) <a id="DoesntWork"></a>

1808) <h3><a class="anchor" href="#DoesntWork">I installed Tor but it's not
1809) working.</a></h3>

1810) 
1811) <p>

1812) Once you've got Tor Browser up and running, the first question to

1813) ask is whether your Tor client is able to establish a circuit.

1814) </p>
1815) 
1816) <p>If Tor can establish a circuit, the onion icon in

1817) Vidalia will turn green (and if you're running Tor Browser, it

1818) will
1819) automatically launch a browser for you). You can also check in the
1820) Vidalia

1821) Control Panel to make sure it says "Connected to the Tor
1822) network!" under Status. For those not using Vidalia, check your <a

1823) href="#Logs">Tor logs</a> for

1824) a line saying that Tor "has successfully opened a circuit. Looks like
1825) client functionality is working."
1826) </p>
1827) 
1828) <p>
1829) If Tor can't establish a circuit, here are some hints:
1830) </p>
1831) 
1832) <ol>
1833) <li>Are you sure Tor is running? If you're using Vidalia, you may have
1834) to click on the onion and select "Start" to launch Tor.</li>
1835) <li>Check your system clock. If it's more than a few hours off, Tor will

1836) refuse to build circuits. For Microsoft Windows users, synchronize your
1837) clock under the clock -> Internet time tab. In addition, correct the

1838) day and date under the 'Date & Time' Tab. Also make sure your time
1839) zone is correct.</li>

1840) <li>Is your Internet connection <a href="#FirewallPorts">firewalled
1841) by port</a>, or do you normally need to use a <a

1842) href="<#NeedToUseAProxy">proxy</a>?

1843) </li>

1844) <li>Are you running programs like Norton Internet Security or SELinux
1845) that

1846) block certain connections, even though you don't realize they do? They
1847) could be preventing Tor from making network connections.</li>
1848) <li>Are you in China, or behind a restrictive corporate network firewall
1849) that blocks the public Tor relays? If so, you should learn about <a

1850) href="<page docs/bridges>">Tor bridges</a>.</li>

1851) <li>Check your <a href="#Logs">Tor logs</a>. Do they give you any hints
1852) about what's going wrong?</li>

1853) </ol>
1854) 
1855) <hr />
1856) 

1857) <a id="TorCrash"></a>
1858) <h3><a class="anchor" href="#TorCrash">My Tor keeps crashing.</a></h3>
1859) <p>

1860)  We want to hear from you! There are supposed to be zero crash bugs in Tor.
1861)  This FAQ entry describes the best way for you to be helpful to us. But even
1862)  if you can't work out all the details, we still want to hear about it, so
1863)  we can help you track it down.

1864) </p>
1865) <p>

1866) First, make sure you're using the latest version of Tor (either the latest
1867) stable or the latest development version).

1868) </p>
1869) <p>

1870) Second, make sure your version of libevent is new enough. We recommend at
1871) least libevent 1.3a.

1872) </p>
1873) <p>

1874) Third, see if there's already an entry for your bug in the <a
1875) href="https://bugs.torproject.org/">Tor bugtracker</a>. If so,
1876) check if there are any new details that you can add.

1877) </p>
1878) <p>

1879) Fourth, is the crash repeatable? Can you cause the crash? Can
1880) you isolate some of the circumstances or config options that
1881) make it happen? How quickly or often does the bug show up?
1882) Can you check if it happens with other versions of Tor, for
1883) example the latest stable release?

1884) </p>
1885) <p>

1886) Fifth, what sort of crash do you get?

1887) </p>
1888) <ul>
1889) <li>

1890) Does your Tor log include an "assert failure"? If so, please
1891) tell us that line, since it helps us figure out what's going on.
1892) Tell us the previous couple of log messages as well, especially
1893) if they seem important.

1894) </li>
1895) <li>

1896) If it says "Segmentation fault - core dumped" then you need to
1897) do a bit more to track it down. Look for a file like "core" or
1898) "tor.core" or "core.12345" in your current directory, or in your
1899) Data Directory. If it's there, run "gdb tor core" and then "bt",
1900) and include the output. If you can't find a core, run "ulimit -c
1901) unlimited", restart Tor, and try to make it crash again. (This core
1902) thing will only work on Unix -- alas, tracking down bugs on Windows
1903) is harder. If you're on Windows, can you get somebody to duplicate

1904) your bug on Unix?)
1905) </li>
1906) <li>

1907) If Tor simply vanishes mysteriously, it probably is a segmentation
1908) fault but you're running Tor in the background (as a daemon) so you
1909) won't notice. Go look at the end of your log file, and look for a
1910) core file as above. If you don't find any good hints, you should
1911) consider running Tor in the foreground (from a shell) so you can
1912) see how it dies. Warning: if you switch to running Tor in the foreground,
1913) you might start using a different torrc file, with a different default
1914) Data Directory; see the <a href="#UpgradeOrMove">relay-upgrade FAQ entry</a>
1915) for details.

1916) </li>
1917) <li>

1918) If it's still vanishing mysteriously, perhaps something else is killing it?
1919) Do you have resource limits (ulimits) configured that kill off processes
1920) sometimes? (This is especially common on OpenBSD.) On Linux, try running
1921) "dmesg" to see if the out-of-memory killer removed your process. (Tor will
1922) exit cleanly if it notices that it's run out of memory, but in some cases
1923) it might not have time to notice.) In very rare circumstances, hardware
1924) problems could also be the culprit.

1925) </li>
1926) </ul>
1927) <p>

1928) Sixth, if the above ideas don't point out the bug, consider increasing your
1929) log level to "loglevel debug". You can look at the log-configuration FAQ
1930) entry for instructions on what to put in your torrc file. If it usually
1931) takes a long time for the crash to show up, you will want to reserve a whole
1932) lot of disk space for the debug log. Alternatively, you could just send
1933) debug-level logs to the screen (it's called "stdout" in the torrc), and then
1934) when it crashes you'll see the last couple of log lines it had printed.
1935) (Note that running with verbose logging like this will slow Tor down
1936) considerably, and note also that it's generally not a good idea security-wise
1937) to keep logs like this sitting around.)

1938) </p>
1939) 
1940) <hr />
1941) 

1942)     <a id="ChooseEntryExit"></a>

1943)     <h3><a class="anchor" href="#ChooseEntryExit">Can I control which
1944) nodes (or country) are used for entry/exit?</a></h3>

1945) 

1946)     <p>

1947)     Yes. You can set preferred entry and exit nodes as well as
1948)     inform Tor which nodes you do not want to use.

1949)     The following options can be added to your config file <a
1950)     href="#torrc">"torrc"</a> or specified on the command line:

1951)     </p>
1952)     <dl>
1953)       <dt><tt>EntryNodes $fingerprint,$fingerprint,...</tt></dt>

1954)         <dd>A list of preferred nodes to use for the first hop in the
1955) circuit, if possible.

1956)         </dd>
1957)       <dt><tt>ExitNodes $fingerprint,$fingerprint,...</tt></dt>

1958)         <dd>A list of preferred nodes to use for the last hop in the
1959) circuit, if possible.

1960)         </dd>
1961)       <dt><tt>ExcludeNodes $fingerprint,$fingerprint,...</tt></dt>

1962)         <dd>A list of nodes to never use when building a circuit.

1963)         </dd>
1964)       <dt><tt>ExcludeExitNodes $fingerprint,$fingerprint,...</tt></dt>

1965)         <dd>A list of nodes to never use when picking an exit.

1966)             Nodes listed in <tt>ExcludeNodes</tt> are automatically in
1967) this list.

1968)         </dd>
1969)     </dl>
1970)     <p>

1971)     <em>We recommend you do not use these</em>

1972)     — they are intended for testing and may disappear in future
1973) versions.

1974)     You get the best security that Tor can provide when you leave the
1975)     route selection to Tor; overriding the entry / exit nodes can mess
1976)     up your anonymity in ways we don't understand.

1977)     </p>
1978)     <p>

1979)     Note also that not every circuit is used to deliver traffic outside of
1980)     the Tor network. It is normal to see non-exit circuits (such as those
1981)     used to connect to hidden services, those that do directory fetches,
1982)     those used for relay reachability self-tests, and so on) that end at
1983)     a non-exit node. To keep a node from being used entirely, see
1984)     <tt>ExcludeNodes</tt> and <tt>StrictNodes</tt> in the

1985)     <a href="<page docs/tor-manual>">manual</a>.

1986)     </p>
1987)     <p>

1988)     Instead of <tt>$fingerprint</tt> you can also specify a <a

1989) 
1990) href="https://secure.wikimedia.org/wikipedia/en/wiki/ISO_3166-1_alpha-2"
1991) >2

1992)     letter ISO3166 country code</a> in curly braces (for example <tt>{de}</tt>),

1993)     or an ip address pattern (for example 255.254.0.0/8).
1994)     Make sure there are no spaces between the commas and the

1995)     list items.

1996)     </p>
1997)     <p>

1998)     If you want to access a service directly through Tor's Socks
1999) interface

2000)     (eg. using ssh via connect.c), another option is to set up an

2001)     internal mapping in your configuration file using
2002) <tt>MapAddress</tt>.

2003)     See the manual page for details.
2004)     </p>

2005) 

2006)     <hr>

2007) 

2008) <a id="FirewallPorts"></a>

2009) <h3><a class="anchor" href="#FirewallPorts">My firewall only allows a
2010) few outgoing ports.</a></h3>

2011) 
2012) <p>
2013) If your firewall works by blocking ports, then you can tell Tor to only

2014) use the ports that your firewall permits by adding "FascistFirewall 1"
2015) to

2016) your <a href="<page docs/faq>#torrc">torrc

2017) configuration file</a>, or by clicking "My firewall only lets me connect
2018) to certain ports" in Vidalia's Network Settings window.
2019) </p>
2020) 
2021) <p>
2022) By default, when you set this Tor assumes that your firewall allows only
2023) port 80 and port 443 (HTTP and HTTPS respectively). You can select a
2024) different set of ports with the FirewallPorts torrc option.
2025) </p>
2026) 
2027) <p>
2028) If you want to be more fine-grained with your controls, you can also
2029) use the ReachableAddresses config options, e.g.:
2030) </p>
2031) 
2032) <pre>
2033)   ReachableDirAddresses *:80
2034)   ReachableORAddresses *:443
2035) </pre>
2036) 
2037) <hr>

2038) 

2039)     <a id="DefaultExitPorts"></a>

2040)     <h3><a class="anchor" href="#DefaultExitPorts">Is there a list of default exit

2041)     ports?</a></h3>