The users are sent to the ISA 2006 server via a GPO. I am in the process of trying to remove all references to the proxy server so that they no longer to go it but are using the URL filtering on the PA. Some seem to still be going to the proxy but I haven't determined the reason yet
Infotech, if you installed the TMG/ISA firewall client on your PC's it must be removed or disabled. Also you will want to disable the auto discover features in ISA. If you are using WPAD entries via DHCP or DNS you will want to eliminate those.
The client was not installed on any of the pc's it was just being sent to the proxy by using a group policy. I do not see it in the server options in DHCP or a DNS reference to it
What happens if you use a browser like Firefox that is not beholden to the GPO (unless you are using a Firefox ADM file) ensuring that the connections settings is set to "No proxy"
We were using TMG 2010 prior to switching over to PA. It was a great change, but I do miss a thing or to about ISA/TMG.
Only suggesting as a troubleshooting step to observe behavior, it could help you narrow down the issue. I am not suggesting that you make a company wide browser change.
Standard GPO is for lack of a better term is ignored by Firefox. Chrome looks at and grabs the settings in "Internet Options" in the control panel by default, so I find Firefox to be a better way to test and troubleshoot weird issues like this.
There is an ADM/ADMX file that you can add to your domain controllers and manage Firefox much like you can manage IE from a GPO standpoint. As long as that had not been done in your environment, the Firefox settings are set to "No Proxy" and there is nothing like the ISA Firewall Client installed on your PC's that is intercepting and tunneling traffic to your ISA Server, then all traffic from that PC "should" follow your standard TCP/IP routes and all traffic, web and otherwise will go through your Palo Alto Firewall and URL filtering will be applied to all traffic where the policy on the PA applies your URL Filtering Security Policy.
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