Server Firewall stalling?

[Mk1_Trebuchet]

Since the last update my dedicated server will run for a while, but then the windows firewall seems to close the port (10308) or at least it becomes unresponsive from outside. (via CanYouSeeMe)  Restarting the DCS server fixes it for a time, but it still 'shuts down' after a while.   I've verified the Windows services are still running and there is nothing of note in the event viewer.  The server seems to be running, and I can connect to it from inside the LAN.....  Been running this server for about a year, this issue only started on the last DCS update. Anyone have any thoughts?

[Mk1_Trebuchet]

Update:  The DCS Server runs for exactly 20 minutes before it stops listening on external 10308... but I can still connect from within the LAN  (All Firewalls and security turned off)   Restarting the DCS server resets the clock. 

Edited February 22 by Mk1_Trebuchet

[Actium]

Your symptoms sound as if your router may be the culprit. AFAIK, DCS can set up port forwarding in your router automatically via UPnP. If, however, your router has a timeout for UPnP-based forwardings and DCS does not renew these periodically, the port forwardings will expire after a timeout. As the forwardings only affect external connections, LAN connections will still work.

[Mk1_Trebuchet]

Turns out that a complete uninstall and re-install of the server cleared it up.  A slow repair didn't have any effect, but completely clearing out the file structures and installing DCS fresh did the trick....  Never touched the port forwarding or router/firewall.