@pixel TURN servers are not really meant to be run behind NAT - having that said, it is possible if you carefully setup your filewall rules and do 1 to 1 port forward in both directions.
See https://github.com/coturn/coturn/blob/master/examples/etc/turnserver.conf#L110 for hints.
Thank you for pointing this out. Like the other VMs, the TURN server is accessible under 443 via HA proxy.
I have already set the value “external-ip=…” to the external WAN IP of the local gateway. However, I cannot find any indication in the readme that I need two external IPs.
I suspect it is due to the 1:1 port forwarding in the outgoing direction. Which ports with which protocol are required here?
We have tried using the Kopano server (https://ucs-turn.kopano.com/turnserverauth/). Despite a good local data line, we often have a standstill with the video. In addition, all data should “stay” here in the house as far as possible with regard to data protection.