[SOLVED] Troubleshooting "There was a problem connecting the video call." errors

I’m using this docker-image for https://hub.docker.com/r/mattermost/webrtc/ janus.

Question: is it nessessary to install mattermost, janus und coturn at the server? My configuration is:

  • mattermost: installed on vpn-server:8065, reachable from internet via nginx reverseproxy from inet-server:443,
  • janus: also installed on vpn-server:7089|7090|8189|8190 inside vpn, reachable from internet via haproxy from inet-server:7089|7090|8189|8190
  • coturn: installed on inet-server:3478|5349|33478

also if i’m testing the coturn-server with turn(-client) - the connection seems ok and is logged by the coturn server. if i’m using mattermost, there is no connection attempt logged in the coturn server logs.