FAF is still experiencing some connection issues, as I believe every one is aware, so just out of curiosity did start doing some troubleshooting. And found this oddity:
in the advanced-ice-adapter.log file, I found this beautiful JSON
19:33:03.408 [JJsonPeer] INFO c.f.i.r.RPCHandler - IceMsg received {"srcId":172610,"destId":21539,"password":"2bp0phl4ge89lh5os1bf27t8i3","ufrag":"be8on1hoo834s9","candidates":[{"foundation":"1","protocol":"udp","priority":2130706431,"ip":"25.14.85.199","port":6519,"type":"HOST_CANDIDATE","generation":0,"id":"50","relAddr":null,"relPort":0},{"foundation":"2","protocol":"udp","priority":2130706431,"ip":"10.0.0.63","port":6519,"type":"HOST_CANDIDATE","generation":0,"id":"51","relAddr":null,"relPort":0},{"foundation":"3","protocol":"udp","priority":1677724415,"ip":"73.157.8.80","port":6519,"type":"SERVER_REFLEXIVE_CANDIDATE","generation":0,"id":"52","relAddr":"10.0.0.63","relPort":6519},{"foundation":"4","protocol":"udp","priority":2815,"ip":"5.161.127.50","port":10622,"type":"RELAYED_CANDIDATE","generation":0,"id":"53","relAddr":"73.157.8.80","relPort":6519},{"foundation":"6","protocol":"udp","priority":2815,"ip":"104.248.242.8","port":55374,"type":"RELAYED_CANDIDATE","generation":0,"id":"54","relAddr":"73.157.8.80","relPort":6519},{"foundation":"6","protocol":"udp","priority":2815,"ip":"104.248.242.8","port":59887,"type":"RELAYED_CANDIDATE","generation":0,"id":"55","relAddr":"73.157.8.80","relPort":6519}]}
If you look at it you will find an IP of 10.0.0.63 (RFC 1918), non-routable IP, why is that ? What is the point ?
If I parse the same log a bit further, I see a lot of connection also to RFC 1918 IP which one more time does not make sense: 192.168.1.100 is my local IP, I would understand this one, but why so many others !
I also run some connectivity test to forcing to some other coturn server, If I select Finland or Germany I cannot connect to any game. I did not find any obvious issue on the Finnish server, but it seems that the German network is having some issue
Here is traceroute: