Questions tagged [obfs4]

This tag is to be used for questions about the Obfs4 pluggable transport (e.g. such as how it works of if there is an issue in using it).

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Is it possible to run an obfs4proxy server and a webserver on the same port simultaneously, á la sslh?

Sslh is a protocol multiplexer that is commonly used to let one log in to a server via SSH on port 443, whilst that server still serves valid HTTPS content on port 443. From its manual, it is ...
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Are obfs4 bridges still effective against state-of-the-art Tor blocking techniques?

In response to the recent upsurge in Tor blocking efforts and following the Tor website recommendations, I decided to run a Tor bridge with obfs4proxy. I would imagine however that obfs4proxy bridges ...
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Is it possible to use built-in bridges or automatically request them for the tor daemon in Linux? (Not Tor Browser)

I want to use obfs4 proxy to connect tor through it. It is not a Tor Browser. I know that Tor Browser provides options to use built-in bridges or request them online, but to use it in tor daemon I ...
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tor log shows ignoring ExcludeNodes?

Tor Log says: [WARN] Not using bridge at [scrubbed]: it is in ExcludeNodes. and [NOTICE] Opened Socks listener on 127.0.0.1:9150 It minds that my tor, conexion/router have been hacked? To put you ...
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obfs4 bridge every 10-20 seconds send and receive some data on static or default browser pages

Is it kind of normal experience? When I'm just on static, already downloaded page or default Tor browser page, in network statistics on PC every ~5-10-20 sec small unidentified packets send or receive ...
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The scary torrc

I've been trying to set exit nodes and obfs4 bridge(country blocking tor) into my torrc file but I can't find a recent post about that or any beginner friendly explanation. Can anyone provide me with ...
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Having trouble connecting to tor via cli but TorBrowser connects without Problems

I'm trying to run tor via terminal because I just need the proxy functionality and not all the other stuff TorBrowser offers. I'm on macOS and installed tor using brew install tor tor is censored on ...
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2 votes
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184 views

Connect to Tor Bridge running on Google Cloud

I deployed a Tor Bridge on Google Cloud. I can connect to the bridge from my local machine(Tor Browser on the local machine) using this - <Googe cloud ip>:9001 9001 is ORPort on Google cloud. ...
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Could not launch managed proxy executable at '/usr/bin/obfs4proxy' ('No such file or directory')

Lately I have been trying to set up an obfs4 bridge on my RaspberryPi 3 (running Raspbian 9 (stretch) ) following the official guide. After setting up the torrc file to: OrPort [PORT1] ...
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Can my university network IT see that I am using Tor when I am using Tor Browser with an obfs4 pluggable transport?

I use my private laptop computer and Tor Browser with an obfs4 pluggable transport to log in my university account. The university network IT does not use Deep Packet Inspection, and the ...
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Can my university network IT see the IP address of the obfs4 bridge node?

Can my university network IT see the IP address of the obfs4 bridge node when I use my private laptop computer and Tor Browser to log in my university network account and connect to the Tor network? ...
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Running an obfs4 bridge: Setting the IP address to advertise

I run a Tor bridge in a FreeBSD jail. I received an email from someone letting me know that a private IP address was being advertised for the obfs4 bridge. In torrc, I set up Tor to advertise my ...
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2 answers
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What is iat-mode at the end of obfs4's bridge lines?

By looking at a obfs4 bridge, we can see that it ends with iat-mode=x which x can be 0, 1 or 2. Bridge obfs4 1.2.3.4:9443 0F2C3218 cert=FH+9dukjekdfhcn iat-mode=0 What does this iat-mode indicates ...
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IS Obfs4 blocked in China now?

My private Obsf4 bridge is "obfs4 205.185.117.208:38571 4C1B1F2F9FF164243E18C571C3920493BA884C64 cert=DXGNrwW4IwFG4zUMzk7GIwP35OTH7iNQ8ZirOublem8eulgLB7vsHQD2V2E0bn2woTdsLQ iat-mode=0" When I tried ...
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Why did Tor Client from Browser in Windows cannot connect to Tor Network using a user-provided Tor Bridge Information

My goal: Establish Tor network from Tor Browser (in Windows 10) using a user-provided Tor Bridge. What I did so far: Following this Tor Wiki, I set an obfs4 Tor Bridge up in an Ubuntu 16.04 machine. ...
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No traffic on obfs4 bridge

I am running an obfs4 bridge on my raspberry pi since 10 days now and haven't seen a single client since then. My torrc looks like this: RunAsDaemon 1 ORPort 9001 ExitRelay 0 BridgeRelay 1 ...
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1 answer
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How does obfs4 work?

First of all, I am already having a working setup of tor as a systemd service that uses obfs4, and using it as proxy by my applications like chrome and firefox, so this is not a question how to make ...
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First version of TOR with obfs4

I have an application that I run that is security minded. It runs Tor 0.2.5.1 and i was wondering if OBFS4 was added to tor before or after this version, does anyone know? (its daemon and runs in ...
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Circumvent methods when Directory Authorities censored [duplicate]

I recently become interested in researching about the Tor network and as I read, there are 9 directory authorities which are hard-coded into the Tor software and they are like phone-book which gives ...
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2 votes
2 answers
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Tails 3.0 blocks connection to ANY obfs4 bridge

I've attempted to use six different obfs4 bridge relays and according to the tor log the connection is terminated. using obfs3 does work. any suggestions? Thanks in advance!!
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1 answer
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Tails/Tor not connecting to Network using multiple OBSF 3 OR 4 bridges

I have a tails install running off USB running on a laptop with Parrot linux installed. Tor connects fine without bridges. I used welcome screen to set up bridge list and cannot connect. Bridges have ...
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can obfs4 bridges bypass china firewall and turkey , iran's block?

can obfs4 bridges bypass china firewall and turkey, iran's block? I know some bridges may not work in those countrys.
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2 votes
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What are security implications of keeping same tor bridges versus rotating?

If a set of obfs4 is working fine should they be kept indefinitely as long as they're still working? How would periodically getting a new set of bridges improve security? Potentially compromise ...
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1 vote
1 answer
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OBSF4 and scramblesuit

It seems I can't connect to OBSF4 or scramblesuit bridges with TAILS. I have no troubble with OBSF3 in Tails. Below is some of the error message. Can you guys help me out? Thanks. 10/08/2016 08:32:03....
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Using tor on FreeBSD

I followed this method on FreeBSD, however, I receive the following errors and I'm not sure why: The only change made on default tor config file is to uncomment the following line on /usr/local/etc/...
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Where can I get my private Obfs4 bridge? [duplicate]

I made a private Obfs4 bridge on my Ubuntu with openVZ on a VPS successfully recently, but I have no idea that what's my bridge and how to find it. I need help, please!
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2 votes
1 answer
2k views

How to use obfs4proxy.exe merely in a console?

I'm trying to use obfs4proxy compiled from Yawning/obfs4, but when I run it in the console, it says [ERROR]: obfs4proxy.exe - must be run as a managed transport I have seen this question. However, ...
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3 votes
1 answer
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find needed details of my own private obfs4 Tor bridge

I've set up a private obfs4 Tor bridge following the official tutorial, PublishServerDescriptor set to 0. /var/log/tor/log shows positive entries so it should be configured correctly. The machine is ...
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Configure Obfs4 proxy with tor

I used obfs3 as socks proxy with Openvpn and it was very easy to configure and operate. I want to use obfs4 proxy. I am running Ubuntu 14.10, i have installed latest tor package version (Tor version ...
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How can I debug Tor connections to see where obfs4 fails?

Tor connects to private obfs4 bridge, but torbrowser fails I setup a private bridge (Tor 0.2.8.4) and tested it with Tor Browser (6.0.2) successfully. When I enabled obsf4 (0.0.3) in the bridge, ...
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Orbot works, but Tor doesn't

I use Tor a lot at work because we have a strict firewall here. Lately my Tor is not able to connect... but Orbot connects normally. I don't know what I supposed have to do... Obs.: Here just meek-...
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1 vote
1 answer
547 views

OBFS4 doesnt connect in iran [duplicate]

I'm using Tor Browser 6.5a1 in Iran. Problem is obfs4 doesn't connect. I already tried using obfs4 bridges but it wasn't helpful. 09/07/2016 07:29:09 ق.ظ.700 [NOTICE] DisableNetwork is set. Tor will ...
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3 votes
2 answers
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problem with obfs4proxy and apparmor (solved)

Finally yesterday I installed ubuntu 16.04 and after that I installed tor and obfs4. I add this line at the end of torrc file: UseBridges 1 Bridge obfs4 82.243.119.185:990 ...
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1 vote
2 answers
1k views

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

I got my own server somewhere out there in the free internet, and I would like to connect to it via obfs4 and use it as proxy to circumvent local censorship. As far as I know, obfs4 requires a tor ...
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0 votes
1 answer
453 views

Can current obfuscators defeat deep packet inspection mentioned in "Seeing through Network-Protocol Obfuscation"?

Wang, L., Dyer, K. P., Akella, A., Ristenpart, T., & Shrimpton, T. (2015, October). Seeing through Network-Protocol Obfuscation. In Proceedings of the 22nd ACM SIGSAC Conference on Computer ...
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3 answers
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Could not launch managed proxy executable at '/usr/bin/obfs4proxy' ('Operation not permitted')

For the life of me, I cannot get my tor bridge relay working with obfsproxy, or obfs4proxy. I am running Ubuntu 15.10 with tor v0.2.7.6 (git-605ae665009853bd). Tor starts and bootstraps fine and is ...
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2 votes
0 answers
4k views

How to use Obfs4Proxy [closed]

Right now I'm using obfs3,obfs2 and b64 with my OpenVPN server and sadly they are slow in my country (Iran) These obfuscation methods are slow at morning and they get fast at after noon (I don't know ...
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0 votes
2 answers
2k views

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

OpenVPN + obfs3 is a popular combination for censorship circumvention, but it's getting slow nowadays. Obfs4 works great with tor, but Yawning Angel seems to not have enough time to make obfs4 ...
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6 votes
1 answer
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How can I start obfs4proxy.exe without starting Tor Browser?

Under WIN7 platform, when I start tor browser, there is a job running in taskmanager named `obfs4proxy.exe. How can i start it through command-line since I don't need tor browser? By the way, I can ...
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2 votes
1 answer
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Tor on computer connects fine using bridges, portable Tor does not

So I'm trying use a java plugin for a game at work. Downloaded portable Firefox/Jportable have it configured with new Java. Wanted to open tor portable and use a separate Firefox portable to use game ...
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6 votes
1 answer
5k views

Tor 4.5.3 - obfs4 bridges can't connect to network [duplicate]

I faced a problem when Tor, which used to work for ages at campus of my friend (he updated it regularly), just stopped working one day. I did the following: Downloaded latest Tor at home. Configured ...
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1 vote
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Obfs4 bridges in Orbot

I can connect to obfs3 bridges just fine and even meek works, but obfs4 bridges seem to immediately reject my client. The debug log output is of no help. It's almost like Orbot isn't sending the ...
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4 votes
1 answer
3k views

Add bridges on expert bundle

I want to add bridges to my expert bundle but have no idea how to create and what to put in the torrc file. First of all, there is no torrc file in the expert bundle, so I assume I have to create it ...
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1 vote
1 answer
675 views

how to run obfs4 in ubuntu as a client?

I wanted to use OBFS4 as a client and not as a server in ubuntu 14.0.4,how can I do it? there were a topic like this on the forum but he wanted to use it as a server not client. thanks a lot.
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2 answers
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How to run an obfs4 bridge?

I want to help censored users. How can I run an obfs4 (Pluggable Transport) bridge on a Debian-like GNU/Linux machine?
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4 votes
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Can someone explain these bridge stats?

I have these stats: # cat /var/lib/tor/stats/bridge-stats bridge-stats-end 2015-02-13 04:17:28 (86400 s) bridge-ips cn=8,es=8,us=8 bridge-ip-versions v4=8,v6=0 bridge-ip-transports <OR>=8,obfs4=...
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