I have the same problem.
And:
If I reboot the Wingate server, everything is fine again. The wonky thing is if I try to disable and re-enable the local network adapter, it won't turn grey. If I try again a few times, it does turn grey, but then won't turn on again. If I now try to reboot the Wingate server it will be stuck at "Restarting ..." and I need to hit the reset button.
Exactly. If I try to disable/enable the network card, the server doesn't restart anymore. You can't touch the network card after that.
In my case after that bug the network card won't ping anything (even locally), and after some minutes windows generally get a BSOD.
That behavior is generally once a week. Only started after I installed Wingate. My system is a Windows 2008 R2 x64, HP Proliant Server.
adrien can you take a look in that? This is a very old bug, it happens to me since wingate 7. I can provide any logs you want.