I am trying to configure a Linux DNS server behind the ISA firewall. I have the linux box setup correctly to resolve names, as it used to be on the public side and worked fine. However, I have assigned it a private ip address, added the old public ip address of the Linux DNS server to the external nic on the isa server, created a new server rule to allow access to the Linux box, and I get nothing. To verify that I setup the rule correctly, I configured a DNS server on a windows machine and followed the exact same steps. It worked perfectly. So as of now, I must ask, is it possible to use a Linux DNS server behind a ISA Firewall, and if so is there anything special that I must do to make it work? Thanks in advance, Paul ì