[tor-bugs] #32657 [Circumvention/Snowflake]: Investigate Snowflake blocking in China

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#32657: Investigate Snowflake blocking in China
-----------------------------------------+-----------------------------
     Reporter:  cohosh                   |      Owner:  cohosh
         Type:  defect                   |     Status:  assigned
     Priority:  High                     |  Milestone:
    Component:  Circumvention/Snowflake  |    Version:
     Severity:  Normal                   |   Keywords:  blocking, china
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:  Sponsor28                |
-----------------------------------------+-----------------------------
 We've been receiving updates from amiableclarity2011 about snowflake
 issues in China for a while now (they first reported the blocking of our
 default STUN servers a while back).

 Recently they have not been able to bootstrap a connection at all. I wrote
 a script for monitoring snowflake health (#32545) to check to see if this
 is due to the faulty snowflake problem we've been having, and ran these
 tests from a VPS in China and a VPS in North America. I was expecting to
 see about half of the snowflake connection attempts to succeed and set a 3
 minute time out on circuit construction. However, what I saw was a 90%
 success rate from North America and a 0% success rate in China.

 This almost certainly due to blocking, and as ambleclarity recently
 confirmed in #32597, not due to the blocking of STUN servers.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32657>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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