ISA Problem

We are experiencing a situation where everynight, at 6:45pm, our VPN services on ISA stop functioning. I’ve checked everything in ISA and validated that there is no scheduled time etc. We have even eliminated the ISA server from the Backup process that starts at 8:00 pm from the primary server. I’ve reviewed everything I can think of on the Primary server that would affect the ISA server and can not find any reason why the ISA shuts down the VPN. Any ideas or suggestions would be greatly appreciated.

bdonals@amsafe.com