All of a sudden today I noticed that the direct tunnel (rock solid for years) has noiw turned into a relayed tunnel with no apparent reason?
I have a static port mapping with relevant firewall riules on the router and none of this has changed.
I can see from the client log file that it is creating a direct tunnel and then falling back to a relayed tunnel.
Seems to fallback when the client attempts a quick burst of UDP connection requests to the peer using ports which seem to be entirely random and obviously will not work as they are not forwarded in the router at the remote/peer end.
Any ideas?