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19 votes
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How to run an obfs4 bridge?

The Tor Project's official guide is available here. It has instructions on how to set up an obfs4 bridge for several platforms, including Debian and Ubuntu. Don't forget to make sure that your OR port ...
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  • 2,762
5 votes

problem with obfs4proxy and apparmor (solved)

In your torrc there is the line ClientTransportPlugin obfs4 exec /usr/bin/obfs4proxy --managed Furthermoer the log file states: Jun 08 21:33:05.000 [warn] Could not launch managed proxy ...
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  • 8,663
5 votes

find needed details of my own private obfs4 Tor bridge

From the obfs4proxy README: The autogenerated obfs4 bridge parameters are placed in DataDir/pt_state/obfs4_state.json. To ease deployment, the client side bridge line is written to DataDir/...
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4 votes

How to run an obfs4 bridge?

Great explanation, it helped me a lot. Like to add the following; These days I do not see a lot of obfs4 traffic yet. If you want to publish as an obfs3 AND obfs4 bridge relay you can change the line ...
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  • 41
3 votes

Tails 3.0 blocks connection to ANY obfs4 bridge

Make sure your time zone and time settings are correct, if your system clock time is off, obfs4 will fail to connect. Tails automatically synchronize time upon start, but sometimes the time ...
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  • 85
3 votes
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Tor 4.5.3 - obfs4 bridges can't connect to network

Obfs3 and Obfs4 have a goal of obscuring traffic so that it looks like arbitrary random data. Some environments have created policies such that if the protocol identified via deep packet inspection is ...
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  • 1,274
3 votes

How can I start obfs4proxy.exe without starting Tor Browser?

I have solved this problem. Under Windows 7, the absolute path must be used for the obfs4proxy configuration in torrc-default; the relative path for obfs4proxy plugin doesn't work! ## obfs4proxy ...
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  • 193
2 votes

Could not launch managed proxy executable at '/usr/bin/obfs4proxy' ('Operation not permitted')

I have finally found a solution to this problem. For me, the offender was the /lib/systemd/system/tor@default.service file. I was directed by Tor ops to modify this file to include only the following ...
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2 votes

Configure Obfs4 proxy with tor

You probably want to have a read through the Pluggable Transport specification, they're controlled and configured through environment variables. You'll need to set them appropriately to get it to work ...
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2 votes
Accepted

How can I debug Tor connections to see where obfs4 fails?

You can edit your ClientTransportPlugin or ServerTransportPlugin for obfs4proxy to include a -logLevel followed by one of ERROR,WARN,INFO, or DEBUG, an -enableLogging=true flag to enable logging, and ...
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  • 10.8k
2 votes

problem with obfs4proxy and apparmor (solved)

You could fix your problem with apparmor like this: First open /etc/apparmor.d/abstractions/tor with your favorite editor (with root user) sudo gedit /etc/apparmor.d/abstractions/tor Then change ...
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2 votes
Accepted

How to use obfs4proxy.exe merely in a console?

A program that wants to connect to obfsproxy must first speak the Socks4 protocol with obfsproxy. obfsproxy also has to be started with the right Tor pluggable transport enviroment variables. There is ...
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2 votes
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Circumvent methods when Directory Authorities censored

In other document I read about if all of this Directory Servers become compromised then relays work as a cache to give the clients a list of Tor servers so it is probably not possible to shutdown Tor ...
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  • 1,342
1 vote

obfs4 bridge every 10-20 seconds send and receive some data on static or default browser pages

There are a few things that could affect traffic timing: Javascript, especially for advertisements, could be periodically uploading/downloading data (for example reporting back to the ad service or ...
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  • 2,648
1 vote

The scary torrc

First of all, backup your /etc/tor/torrc and revert to the original of something breaks. cp /etc/tor/torrc/ /etc/tor/torrc.backup All of the rest is in the manual. Exit nodes: ExitNodes node,...
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  • 2,141
1 vote
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Having trouble connecting to tor via cli but TorBrowser connects without Problems

I managed to get it working by setting the tor Data Directory to the same Data Directory of TorBrowser. I added this to my torrc: DataDirectory /Users/armin/Library/Application Support/TorBrowser-...
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1 vote

Can my university network IT see that I am using Tor when I am using Tor Browser with an obfs4 pluggable transport?

The Tor Project put out a basic obfs4 Transport Evaluation. The pertinent quote is: The (obfs4) design improves on the vulnerability to censorship based on active attackers identifying suspect ...
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  • 2,141
1 vote

What is iat-mode at the end of obfs4's bridge lines?

Based upon the code that Andrei posted, it seems that 0 means IAT obfuscation is off, 1 means it is enabled, and 2 is paranoid. A random paper I found says IAT stands for "Inter-Arrival Time"...
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1 vote

No traffic on obfs4 bridge

I have the same problem. Did you restart tor or reboot your pi very often before you got all working and up for longer time? After i set up my bridge the first time i allways had 1-3 unique clients ...
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1 vote

Tails 3.0 blocks connection to ANY obfs4 bridge

Set the time zone to London and change time to London time. You can update the time first when you connect to the wireless internet (not yet configuring tor), once that is done you can connect without ...
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1 vote

can obfs4 bridges bypass china firewall and turkey , iran's block?

it depends on usage case, but generally - yes. Obfs 3 and 4 are good when properly used - as all bridges you need to pay attention to elaborate the bridge key. But in such a countries you better use a ...
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  • 5,421
1 vote
Accepted

What are security implications of keeping same tor bridges versus rotating?

Bridges are like guards, there are advantages to keeping them and advantages to changing them. As a general rule you want to keep guards for as long as you can. Given a hypothetical pair of evil ...
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  • 10.8k
1 vote

OBSF4 and scramblesuit

My little trick to connect to more obfs4 bridges in TAILS: First collect some working bridges via bridge DB (e.g. obfs3) or connect to regular tor. When connected cut the connection in the on/off ...
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  • 11
1 vote

I want to use a private obfs4 tor bridge, without tor

obfs4 does not have a standalone mode like obfs3 does. It talks to Tor using the Pluggable Transport protocol (specification), so to use it for something else you could write a program implementing ...
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1 vote

I want to use a private obfs4 tor bridge, without tor

You need to use it with Tor, because the bridge - after passing through OBFS4(and any pluggable transport) expects a tor protocol, it's not a transparent proxy
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  • 5,421
1 vote

Could not launch managed proxy executable at '/usr/bin/obfs4proxy' ('Operation not permitted')

I modified apparmor profile /etc/apparmor.d/system_tor, just added three lines in it: /usr/bin/obfsproxy PUx, profile /etc/apparmor.d/usr.bin.obfsproxy { } Whole file sample: # vim:syntax=apparmor #...
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  • 11
1 vote
Accepted

How would I go about making obfs4 a standalone proxy for usage with OpenVPN or other programs?

obfs4 and obfs3, among others, are "pluggable transports", and the protocol they speak to Tor is well specified. You could write a program / script to implement that protocol in order to use any ...
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1 vote

Tor on computer connects fine using bridges, portable Tor does not

I used to have a similar problem as you. Now it is fixed for me, using the method described here: https://trac.torproject.org/projects/tor/ticket/17377 obfs4proxy crash no apparent reason ...
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1 vote

Add bridges on expert bundle

Give me an example of what it should include: This is an example torrc file: DataDirectory C:\Documents and Settings\ron\Desktop\Tor\Data #ControlPort 9151 SocksPort 9150 # UseBridges 1 # bridge 60....
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  • 708
1 vote
Accepted

how to run obfs4 in ubuntu as a client?

Just download the Tor Browser alpha release, it includes the obfs4 binary and allows you to configure it easily.
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