NC 11 spreed app no access outside LAN

At least this is the first thing I would try, if spreed inside LAN and nextcloud generally outside LAN works fine. For me it also works just with TURN server, and so far I did not yet understand in what cases STUN could already work and how one could achieve this for his own server.

In case:

		apt-get install coturn
		openssl rand -hex 32
                        => XXX
		nano /etc/turnserver.conf
			listening-port=8443
			fingerprint
			lt-cred-mech
			use-auth-secret
			static-auth-secret=XXX
			realm=your.server.domain
			total-quota=100
			bps-capacity=0
			stale-nonce
			log-file=/var/log/turn.log
			no-loopback-peers
			no-multicast-peers
		nano /etc/default/coturn
			TURNSERVER_ENABLED=1
		service coturn restart

In nextcloud admin panel:

Spreed video calls

STUN server:                 your.server.domain:8443
TURN server:                 your.server.domain:8443
TURN server shared secret:   XXX
TURN server protocols:       udp and tcp
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