@Clive_A Moving the service to an alternate port was the solution here. The service has been up and running for 3 days now, what was certainly not possible the last weeks. One thing, to my opinion it...

@Clive_A The router does not respond at UPD port 1194 at all when the issue appears. I tried it with Ncat. VPN not operational: nc -v -u -z -w 3 192.168.0.1 1194 Ncat: Version 7.50 Ncat: Connected to...

@Clive_A I am in The Netherlands. Android and Windows client are resp. on version 3.7.1 and 3.7.2.

@Clive_A The problem appeared spontaneous. It was not due to a system upgrade. It happens randomly since a week ago. Sometimes when a device is connected, sometimes when I try to connect. The router...

Same problem here. Also started some days ago. Until then it was rock solid stable. Hope we can soon continue to work from remote again.