[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4126: Unit test suite inconsistently failing on CircleCI

[Tahoe-LAFS]

#4126: Unit test suite inconsistently failing on CircleCI
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     Reporter:  hacklschorsch       |      Owner:  hacklschorsch
         Type:  defect              |     Status:  assigned
     Priority:  normal              |  Milestone:  undecided
    Component:  dev-infrastructure  |    Version:  n/a
   Resolution:                      |   Keywords:  ci
Launchpad Bug:                      |
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Comment (by btlogy):

 Also be happening in Windows:

 https://app.circleci.com/pipelines/github/LeastAuthority/tahoe-
 lafs/1216/workflows/27697f8b-e55e-4a4d-953a-09c2dfbce129/jobs/14801/tests
 #failed-test-0

 `allmydata.test.test_system.HTTPSystemTest`: `test_mutable_sdmf`

 `allmydata.mutable.common.NotEnoughServersError: ("Publish ran out of good
 servers, last failure was: [Failure instance: Traceback: <class
 'twisted.internet.error.ConnectingCancelledError'>`

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4126#comment:10>
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