Opened 5 weeks ago

Last modified 9 hours ago

#27723 new task

Obfs4 stopped working 16 Sept 18

Reported by: mwolfe Owned by: dcf
Priority: Medium Milestone:
Component: Obfuscation/Censorship analysis Version:
Severity: Normal Keywords: censorship block ae obfs4 meek
Cc: Actual Points:
Parent ID: Points:
Reviewer: Sponsor:

Description

I was using obfs4 on 15 Sept 18, but shortly after midnight, it stopped working, and I'm using azure. I assume that's the only thing that works when obfs4 fails.

Child Tickets

Change History (9)

comment:1 Changed 5 weeks ago by mwolfe

I forgot to mention I am in the UAE.

comment:2 Changed 5 weeks ago by Dbryrtfbcbhgf

  1. After the connection fails click on configure, or just cancel the connection and then click configure.
  2. Make sure tor is centered in my country is checked
  3. Check request a bridge from Torproject.org and click on request the bridge
  4. Fill in the captcha and click the return “enter” button on your keyboard.
  5. It should now connect

Here’s an explanation on how to manually connect to a bridge.

https://tb-manual.torproject.org/en-US/bridges.html

comment:3 Changed 5 weeks ago by cypherpunks3

I assume that's the only thing that works when obfs4 fails.

Try snowflake ;)

comment:4 Changed 5 weeks ago by mwolfe

After 1 day, whatever was blocking obfs4 disappeared (meek is very slow, but better than no access at all; but I tried obfs4 again, and late today, it worked). This happened before, when obfs4 could not access any websites for a few days, and then it could again. Back then, there were 2 meeks, and I had better luck with the other one than with Azure.

comment:5 Changed 5 weeks ago by mwolfe

I went back to the stable Tor (I was having problems with the unstable), and no snowflake appears on stable Tor. Unless I installed it wrong. I tried to go back to stable, and it was difficult, since the unstable puts stuff in that breaks the stable version on a Mac (both stable and unstable share a directory with stuff that doens't get overwritten with a normal install). Is there a way to do a clean install of Tor?

comment:6 Changed 5 weeks ago by Felixix

After 1 day, whatever was blocking obfs4 disappeared (meek is very slow, but better than no access at all; but I tried obfs4 again, and late today, it worked).

Is this about build-in obfs4 bridges? There was a 4 hours maintainance of two bridges with offtime and a possible overload of the remaining ones.

This happened before, when obfs4 could not access any websites for a few days, and then it could again.

If this was around end of July we might have had a gap because of the change to the new Bridge Authority Serge.
Both would be technical cases and no blocking events. If this does not meet your observation disregard the said.

comment:7 Changed 5 weeks ago by traumschule

Component: - Select a componentObfuscation/Obfsproxy
Owner: set to asn

comment:8 Changed 5 weeks ago by dcf

Component: Obfuscation/ObfsproxyObfuscation/Censorship analysis
Keywords: censorship block ae obfs4 meek added
Owner: changed from asn to dcf
Type: enhancementtask

comment:9 Changed 9 hours ago by arma

I would assume the issue here is that the person's specific obfs4 bridges stopped working, e.g. they went down, not that the obfs4 protocol started getting blocked.

One corollary is that we need to do a better job of teaching people how each pluggable transport design works, e.g. in some of them you need to get individual bridges, and those bridges need to stay up and also not discovered by the censor. (I don't know of any cases where UAE blocked specific bridges by IP address, but in China they definitely do.)

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