I have ISA2000/w2k3. There is a server publishing rule that publishes a SMTP server behind ISA. I wanted to ping it from internet. By default, ISA won't allow ICMP. So, I followed an ISAserver.org article to open up ICMP query and ICMP outbound for the IP number (x.x.x.40) on the external NIC. The ping works fine from the internet. My question is this: When I ping the external IP x.x.x.40, does that ping request go to the SMTP server and a response is returned? Or, just ISA responds to the ping request itself? I opened up the PING port on a non-used external IP number without publishing any servers internally for that IP. I got the PING reply. So I wonder? Thanks NOTE: I definitely don't want to allow PING for the SMTP, but just want to find out how ISA does the pings. Thanks --------------------------------- Do you Yahoo!? The all-new My Yahoo! ? Get yours free!