I seem to have a bit of a stability problem with my ISA Server. Every month or so, my ISA seems to stop allowing connections to certain published services (mail, dns, http etc). Proxy browsing out of our firewall works fine, but anyone accessing services from outside the firewall are refused. I cannot find any patterns. Restarting the services seems to fix the problem. Can anyone give me any pointers on how to troubleshoot this. I would also like to try and setup an alert for when this happens again. As this would run behind the firewall, I am not sure what I can check to see if this problem is happening. Has anyone got any ideas ? Patrick