I have a ISA 2006 server setup in single adapter mode, it's being used just as a proxy, it has web filtering software installed on it.
Many users have the firewall client installed. Starting a few days ago users have a red x in the firewall client. "Disabled: cannot authenticate to ISA server".
Any ideas? I'm not sure how to trouble shoot this or what logs to look at, thanks. I have rebooted the pc's and the server itself, no luck.