OK, I have the book. I have read about back to back DMZ configurations. I also read the article on the website specific to back to back configurations. I am currently running one ISA server and have plans to setup a back to back configuration. I read the portion of the article that discussed the server chain for incoming and outgoing requests. In the future I plan to have a front end/back end exchange environment. My www server is also internal. What happens to my server publishing rules that are pointing to the external interface of my current ISA. I guess I am just not making the connection as far as what happens to my existing server publishing rules if the servers are to remain on my internal network. Any ideas will be sure to help. Thanks again, MRL