je suis dans le même constat, “Port 5223 is not reachable from the outside” alors que c’est ok dans les paramèters du par-feu de Yuno.
Yuno tourne sous un RPi400, en 12.0.16, VPN d’un membre FFDN
I also have this problem. ss -lntu | grep 5223 shows nothing is listening behind this port. I even restarted prosody and coturn. I’m running on a VPS that only blocks smtp by default. Maybe the port is used only occasionally? I wonder what service in prosody uses this port.