[tor-bugs] #21305 [Obfuscation/Snowflake]: Client gets into an unrecoverable connect / close loop

[Tor Bug Tracker & Wiki]

#21305: Client gets into an unrecoverable connect / close loop
-----------------------------------+--------------------------
 Reporter:  arlolra                |          Owner:  cohosh
     Type:  defect                 |         Status:  assigned
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
-----------------------------------+--------------------------

Comment (by arlolra):

 > So when you were in this connect/close loop, were you unable to send and
 receive traffic?

 This was @arma's client and I believe they refreshed their browser window
 a few times to no avail.

 But note that this was during a period of time when the standalone go-
 proxies that we're running (and currently handle the majority of capacity)
 were in a pretty unreliable state and we did not confirm that the new
 proxy we tried to hand them was the one they actually connected to in that
 log.

 Maybe they just got lucky when restarting the client?

 > Or is this just usual behaviour like in #25429?

 For the most part, yes.  The suspicious thing is that they suddenly
 received a proxy that was able to send messages upon restarting.

 Short of manual inspection, you could try establishing a connection and
 then disconnecting your network, waiting a bit, and reconnecting a few
 times to see if it's reproducible.  Otherwise, feel free to close it as
 "worksforme".  If it's really a client issue, it'll rear its head again
 and we'll have fresher data to work with.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21305#comment:4>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online