Hi everyone!
I am running a TMG Firewall with about 200 users connected on Server 2008 R2 - patch level 7.0.9193.601.
It is virtualized on a Hyper-V 2008 R2. Additionally we have 4 IPsec Site2Site VPNs configured in Windows Advanced Firewall - as TMG doesn't provide such a comfortable way to configure them directly in TMG.
About 3 Months ago that TMG started to lose connectivity from time to time. At first we were not monitoring that problem precisely as we thought it was an isp issue but some days before christmas that tmg server just dropepd every outgoing connection and stopped listening!
I was able to control the server over hyper-v directly but no connection in or outbound could be established. (no VPN inc or surf outgoing)
I checked the event logs and there was NO other error than the errors from TMG connection verifiers...
As far as I was able to tell tmg still worked as far as logs and engine was conserned but no routing was done at all!
The last resort was to reboot the TMG then everything worked as before...
This behavior then appeard every 4 days... - simple workaround scheduled reboot every 3 days!
But that is no statisfying solution.... additionally some vpn users reported that their connections has quite annoying drops from time to time, unfortunately I was not able to trace the error.
Possible sources that I can exclude:
-Backup (online snapshot with ArcServe - the server was NOT saved)
-AV (Symantec Endpoint protection 12.1 - was uninstalled nothing changed)
Any ideas??
Best regards
