[tor-bugs] #31960 [Circumvention/Snowflake]: Hello, currently, in China, Tor Browser 9.0a7 version can't establish a Tor network connection through snowflake bridge

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#31960: Hello, currently, in China, Tor Browser 9.0a7 version can't establish a Tor
network connection through snowflake bridge
-------------------------------------+--------------------------
 Reporter:  amiableclarity2011       |          Owner:  cohosh
     Type:  defect                   |         Status:  assigned
 Priority:  Immediate                |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
-------------------------------------+--------------------------
Changes (by cohosh):

 * owner:  (none) => cohosh
 * status:  new => assigned


Comment:

 Thanks for the heads up. I'm looking into this today.

 I'm getting the following in the snowflake logs:
 {{{
 2019/10/04 14:24:33 BrokerChannel Response:
 504 Gateway Timeout

 2019/10/04 14:24:33 BrokerChannel Error: Unexpected error, no answer.
 2019/10/04 14:24:33 Failed to retrieve answer. Retrying in 10 seconds
 2019/10/04 14:24:43 Negotiating via BrokerChannel...
 Target URL:  snowflake-broker.azureedge.net
 Front URL:   ajax.aspnetcdn.com
 2019/10/04 14:24:45 BrokerChannel Response:
 200 OK

 2019/10/04 14:24:45 Received Answer.
 2019/10/04 14:24:45 ---- Handler: snowflake assigned ----
 2019/10/04 14:24:45 Buffered 291 bytes --> WebRTC
 2019/10/04 14:24:46 WebRTC: DataChannel.OnOpen
 2019/10/04 14:24:46 Flushed 291 bytes.
 2019/10/04 14:24:48 WebRTC: DataChannel.OnClose [remotely]
 }}}

 So the first try for a snowflake resulted in a timeout, and the second try
 resulted in the snowflake proxy closing the connection for some reason.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31960#comment:2>
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