Here is what I get :
root@domain:/# tail -f /var/log/messages
Dec 7 08:41:04 domain turnserver: 0: turn server id=0 created
Dec 7 08:41:04 domain turnserver: 0: IO method (general relay thread): epoll (with changelist)
Dec 7 08:41:04 domain turnserver: 0: turn server id=3 created
Dec 7 08:41:04 domain turnserver: 0: turn server id=2 created
Dec 7 08:41:04 domain turnserver: 0: turn server id=1 created
Dec 7 08:41:04 domain turnserver: 0: Total General servers: 4
Dec 7 08:41:04 domain turnserver: 0: IO method (auth thread): epoll (with changelist)
Dec 7 08:41:04 domain turnserver: 0: IO method (auth thread): epoll (with changelist)
Dec 7 08:41:04 domain turnserver: 0: IO method (admin thread): epoll (with changelist)
Dec 7 08:41:04 domain turnserver: 0: SQLite DB connection success: /var/lib/turn/turndb
Whether I try to connect or not, nothing more hapens.
Maybe could I give you prrivatly the connexions name and pass in order to see if your Nextcloud could connect my turn server ?