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Re: [tor-talk] my tor connection always timed out these days


According to the recent research of [1], I think it is useless to obtain the new bridges that does not support Obfsproxy [2] in China. Even if the Chinese users derive the new bridges which are not blocked in China, once the bridges are used by them, these bridges will be promptly discovered by GFC based on the protocol-level bridge discovery approach and then blocked. Therefore, currently, in order to effectively connect to the Tor network in China, the Chinese users should use the Obfsproxy to obfuscate the specific feature of the TLS protocol used by Tor. Since SkypeMorph [3] is not widely deployed, Obfsproxy is the only tool that we can use.

However, how do people in China retrieve the Obfsproxy supported bridges? Still obtain them via emails or https? [1] indicates that the 13 hard-coded obfsproxy bridges in the official obfsproxy bundle have been already blocked.

[1] http://www.cs.kau.se/philwint/static/gfc/
[2] https://www.torproject.org/projects/obfsproxy.html.en
[3] http://cacr.uwaterloo.ca/techreports/2012/cacr2012-08.pdf

On 11/04/2012 10:48 AM, Sam Whited wrote:
Looks like about 80% of bridge relays are blocked from China these
days (via the March 2012 progress report:

"We developed a tool for scans of bridge lists which attempts to
     either open a simple TCP connection to the bridgeÃââs OR port or that
     will perform a full Tor handshake to the bridge. We tested the
     scanner by running a scan from Germany,
     and comparing results to bridge reachability information obtained
     from the bridge authority in The Netherlands. We also performed a
     scan from China,
     and found that over 80% of bridges were unreachable. We compared
     active scan results to passive usage statistics,
     and confirmed that bridges that were found as unreachable in the
     scan also reported significantly fewer connections from China than
     other bridges."

If you can't make a TCP connection to your bridge addresses, you may
need to just keep requesting more until it works.


On Wed, Apr 11, 2012 at 08:34, åææ<zeus2615@xxxxxxxxx>  wrote:
This is a Chinese user
I added some new bridges, but that does not make it better.
My message log shows it always stuck at 80%

Anyone help?
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