Upstream issue: https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/obfs4/-/issues/32439 _Originally created by @goupille on [#15548 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/15548)_ Several users reported having issues with obfs4 since a few weeks. I tried with the following bridges ``` obfs4 76.74.178.195:9443 406A8B5869B72221036291407EC3688C69995F80 cert=FY2R16JOoE2VNCU2gVLWBj6Gg+YBP7mTLU5zl12Fz9iC5TQG6SqE71CFhD3zIuJcEFrcMQ iat-mode=0 obfs4 91.89.79.175:43099 681DD069768F8DF5C94284FFE8CEA600C6EAFB86 cert=Dux9bBro6xfxb7rUr8wdp0TephA7wMV0MjPMAcNqkU/r1Q+56EpHypOFZHRZFDukZNCHYg iat-mode=0 obfs4 34.203.58.40:9443 A3C8B95009DB61BE34B2628C9B9B4E66FCA32FA3 cert=etaJXxltJNQxJlKxVgGXWakop242cHNtzxG/GKroXYPTlzvmsYh818WrcIJ5cZ4DbZREJA iat-mode=0 ``` and ended up with Tor launcher stuck on “Loading Network Consensus” for at least 15 minutes. I saw this behaviour two times on three trials. I attached a whisperback report and the content of /var/log/tor/log, they are showing a weird jump back in the time : Apr 20 14:17:56.000 [info] connection_edge_process_inbuf(): data from edge while in 'waiting for connect response' state. Sending it anyway. package_partial=1, buflen=214 Apr 20 14:17:56.000 [info] handle_control_authenticate(): Authenticated control connection (23) Apr 20 11:30:00.000 [notice] Interrupt: exiting cleanly. Apr 20 11:30:00.000 [info] or_state_save(): Saved state to "/var/lib/tor/state" # Design We designed an UI for manual time sync when people choose to hide Tor: <img src="https://gitlab.tails.boum.org/tails/blueprints/-/wikis/network_connection/hide_-_time.png"> If we can't determine whether we have IP connectivity to the bridge, we might have to add captive portal configuration to the dance and I should go back to the drawing board. # Follow-up tasks - [x] check if the MR closes #11589; if it does, remove the fragile tag in `tor_bridges.feature` - [x] check if the MR closes #5394 as well: !542 does # Attachments * [bug report - obfs4](https://redmine.tails.boum.org/code/attachments/download/1978/bug%20report%20-%20obfs4) * [journal.txt](https://redmine.tails.boum.org/code/attachments/download/2035/journal.txt) * [torlog.txt](https://redmine.tails.boum.org/code/attachments/download/2036/torlog.txt) # Related issues - **Related to** tails/tails#15743 - **Related to** tails/tails#16972 - **Related to** tails/tails#15599 - **Related to** tails/tails#17525 - **Has duplicate** tails/tails#9268 - **Blocked by** tails/tails#15168 - **Blocked by** tails/tails#5774