I have set up my system from the step by step buides on isaserver.org. Most things are working great, thanks for the help. I have a strange problem though that is not linked to ISA directly. I have internal and external DNS servers. Internal clients use the internal server that then forwards to our ISP's server. Here is the problem. When I type "nslookup machine.name.com" I get the internal IP address (As looked up from internal server) for the machine. When I type "ping machine.name.com" it pings the external IP (what one of the external DNS servers would be returning).Has anyone seen this before. It is causing me a few headaches. Any help appreciated. Jon