I have a new install of ISA 2006 configured on a server with 2+ network cards. I can access HTTP sites ok from the ISA Server (Local Host). On a computer located on the Internal Network, I can access sites through HTTPS ok (example: my internet banking). However, when i attempt to access an HTTP site (www.google.com, www.yahoo.com, etc etc) I immediately get a generic'cannot find server, or DNS error'.
I DO have a rule to allow ALL traffic from the internal network to the External and I am able to ping sites externally, I can use MSN Messenger ok, etc. Just no HTTP access.
ISA Server logging shows the connection gets initiated, but then nothing really happens after that.
Firewall Client and Web proxy client are not enabled for the Internal Network.
I'm not really sure what to look at next, but if someone could point me in the right direction it would be greatly appreciated.
Josh, Try disabling the HTTP filter under Configuration -> Add-ins. If disabling the HTTP filter make things work, try playing with the filter settings. the HTTP filter can't process the outgoing HTTPS traffic and you have HTTPS working but not the HTTP.
Actually, I discovered that the HTTP protocol properties in my Internal Network Internet Access rule had the Web Proxy filter enabled. In my scenario, this was not a requirement due to the way the internal network clients are configured. Disabling the filter for this rule fixed the problem.
Thanks to everyone for the suggestions, they definitely helped me eliminate other potential issues from the list.