We have a Cisco 2911 running the firewall feature set and NAT for several servers. The problem is that every so often, maybe twice a day or twice a week, we get reports that our webserver is down. We can still get to it internally (10.1.X.X), but not from outside the company. The other websites and exchange server are still reachable from outside. To resolve the problem we just reboot the Cisco 2911 router and it is functioning properly again. We still want to find out what the problem is. Can anyone be of help?