[tor-bugs] #30368 [Obfuscation/Snowflake]: Run some tests to check reachability of snowflake proxies

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#30368: Run some tests to check reachability of snowflake proxies
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 Reporter:  cohosh                 |          Owner:  cohosh
     Type:  task                   |         Status:  assigned
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by cohosh):

 Replying to [comment:5 dcf]:
 > Replying to [comment:4 cohosh]:
 > > snowflake-bridge is the location of our fallback standalone proxy-go
 instances that we know have been blocked. It's interesting that blocking
 of this proxy comes and goes.
 >
 > Yeah. A >50% success rate, a rate that matches that of the other proxy
 you set up, doesn't look like IP blocking. Possibly not even blocking at
 all. It could be that in #30350 the reporter just experienced Snowflake
 not working very well yet, and wrongly interpreted it as the result of
 blocking. I know that I've never been able to use Snowflake for more than
 an hour or so because it always quits working--I suspected #25429 but
 never tracked it down, and of course there have been plenty of other bugs.
 Hm, fwiw, when I was doing manual checks around the time the ticket was
 filed the snowflake.bamsoftware.com proxy-go instances were reliable and
 reachable from the US but definitely not from the VPS in China. At the
 same time, the additional proxy-go instances I set up on another server
 was definitely reachable from both places.

 What do you mean by success rate here? The other proxy I set up is
 reachable 100% of the time (in that it bootstraps past the 10% that all
 snowflake connections automatically bootstrap to).

 I think there's more going on here than just the usual snowflake bugs, but
 I think #25429 will go a long way to mitigate the impact of whatever is
 going on.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30368#comment:6>
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