I am publishing an internal webserver through ISA. Everything seems to work fine for a while then the publishing rule seems to stop working. I start and stop the web proxy and the firewall services and it does not start working again. If I restart the ISA server everything works fine again for a few days. I am publishing a student web-based mailserver and OWA and they never hang up. I am also publishing terminal services for desktop access for approx. 10 workstations and they never fail. It's difficult to tell that it isn't working unless I try to access it from the outside.There doesn't seem to be any errors in the logs when this happens. I have approx 20 IP adresses that we are using on the external nic. Any Help would be appreciated.