[tbb-bugs] #30575 [Applications/Tor Browser]: "unable to connect" if Firefox GPOs configure proxy settings

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu May 23 09:00:16 UTC 2019

#30575: "unable to connect" if Firefox GPOs configure proxy settings
 Reporter:  kT3Ycp9jwm                           |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  TorBrowserTeam201905,                |  Actual Points:
  GeorgKoppen201905, tbb-proxy-bypass            |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:

Comment (by kT3Ycp9jwm):

 Replying to [comment:6 gk]:
 > But either way, I think the underlying bug is that Tor Browser is
 affected by this Firefox policy at all and its proxy settings can get
 changed that way
 Yes, I think this is the point

 Using a local account, who does NOT receive the GPO, Tor Browser works.
 Using a domain user, who receives the GPO, Tor Browser does NOT work.

 Tor network settings (behind the onion button) are the same in both cases,
 so I think they are ok.
 The difference is in the connection settings (Menu --> Options --> Network
 proxy --> Settings): when the GPO applies, proxy settings are hijacked and
 I cannot revert them because they're locked.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30575#comment:7>
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