I am currently running Squidnt as a local proxy server. I have 3 instances of squid running on different ports each forwarding to a different port on the e2bn proxy servers. The reason for this is that each port on the e2bn proxy servers provide different levels of filtering, middle, upper, staff etc. Then through gpo's I can direct users to the apporpiate port. My question is can this be done with isa server.