We are experiencing some issues with some of our enterprise customers not being able to establish calls, even though they said they configured the firewalls according to the docs: https://docs.livekit.io/home/cloud/firewall/ The livekit connection tester unfortunately does not provide a clear reason for this apart from showing this error:

Error: could not establish pc connection

Do you have any clue or experience from other customers running into similar issues, what could cause this and how to resolve it? Full logs:

Connecting to signal connection via WebSocket
Connected to server, version 1.9.1.
LiveKit Cloud: Germany 2
Establishing WebRTC connection
udp 161.115.161.162:50001 host
udp [2603:c020:8017:2700::784c:7937:e965]:50001 host
tcp 161.115.161.162:7881 host (passive)
tcp [2603:c020:8017:2700::784c:7937:e965]:7881 host (passive)
udp 161.115.161.162:50008 host
udp [2603:c020:8017:2700::784c:7937:e965]:50008 host
tcp 161.115.161.162:7881 host (passive)
tcp [2603:c020:8017:2700::784c:7937:e965]:7881 host (passive)
tcp 161.115.161.162:7881 host (passive)
tcp [2603:c020:8017:2700::784c:7937:e965]:7881 host (passive)
udp 134.209.230.248:50009 host
udp [2a03:b0c0:3:f0::1:6f04:f000]:50009 host
tcp 134.209.230.248:7881 host (passive)
tcp [2a03:b0c0:3:f0::1:6f04:f000]:7881 host (passive)
udp 134.209.230.248:50010 host
udp [2a03:b0c0:3:f0::1:6f04:f000]:50010 host
tcp 134.209.230.248:7881 host (passive)
tcp [2a03:b0c0:3:f0::1:6f04:f000]:7881 host (passive)
udp 161.115.161.162:50008 host
udp [2603:c020:8017:2700::784c:7937:e965]:50008 host
tcp 161.115.161.162:7881 host (passive)
tcp [2603:c020:8017:2700::784c:7937:e965]:7881 host (passive)
udp 161.115.161.162:50007 host
udp [2603:c020:8017:2700::784c:7937:e965]:50007 host
tcp 161.115.161.162:7881 host (passive)
tcp [2603:c020:8017:2700::784c:7937:e965]:7881 host (passive)
Warning: ports need to be open on firewall in order to connect.
Error: could not establish pc connection
Can connect via TURN
Can publish audio
Error: could not establish pc connection
Can publish video
Error: could not establish pc connection
Resuming connection after interruption
Error: could not establish pc connection
Fail

I did see this post, but I didn't have any suggestion other than "perhaps the firewall configuration was not properly followed", which didn't feel constructive as a reply 😬. Trying to be more helpful: Devin has some more specific suggestions of what might be wrong with the config: https://deepwiki.com/search/what-is-causing-this-error-con_aeb2d1a3-59f7-46fd-8c7a-4b232175513f?mode=fast

Alright thank you! It's a bit weird as we are running into this issue with the third customer now...

If you have any suggestions about what we could improve in the docs, e.g. if there's something missing, then please let me know and we can get them fixed. Also, if there's anything misleading let me know and I can provide that feedback to the team.