We hit a new issue this week, we were getting failed connections on our Always-on VPN RAS servers, and on checking the servers, it appeared the ras service had hung. No errors in the logs, existing clients dropped off and we couldn’t restart the service, a reboot was the only option. We tracked this down to the AV – McAfee in our case – looks like it couldn’t handle the number of connections and died taking the Ras service with it.
Removing McAfee and rebooting and the servers have now been stable with no further hangs.