[tor-bugs] #25600 [Obfuscation/Snowflake]: Tor eventually hits "No running bridges" with Snowflake

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#25600: Tor eventually hits "No running bridges" with Snowflake
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 Reporter:  cypherpunks            |          Owner:  (none)
     Type:  defect                 |         Status:  reopened
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by cypherpunks):

 Replying to [comment:12 dcf]:
 > I have encountered this "No running bridges" problem too. I wonder if it
 happens when a snowflake proxy comes online but it behind a kind of NAT,
 or something, such that it can't actually do WebRTC.
 I don't think that's the case since I almost always hit the fallback proxy
 (the 37... one) and this problem always happens when I use snowflake.

 But I think I finally nailed it: When I followed your suggestion to use
 `-log snowflake.log` I no longer had that problem (it's been a couple of
 hours now of testing, hopefully there will be no other surprise). So I
 think there's definitely some issue in the patch for #25471. This also
 confirms my results in comment:6 where I didn't have this problem with the
 earlier build of snowflake.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25600#comment:13>
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