When I remove the STUN server from the config, the server starts.
When I try to call I get this error in the Mattermost log:
[2017/02/24 19:06:18 CET] [EROR] /api/v3/webrtc/token:WebRTC.Token code=500 rid=owj8ex4x3tr7pg7jm13fwakhww uid=qnuboez45t88bgaj1nb9hcqnbw ip=10.231.163.59 We encountered an error while connecting to the server [details: Post https://dockerhost:7089/admin: dial tcp: lookup dockerhost on 10.231.160.29:53: no such host]
Janus console logs nothing - obviously because it seems that Mattermost cannot find the janus server.