unixgy,
It would be better if you would put your question as a new posting instead of attaching it to an existing post, as it is a totally different question.
Anyway, your need to explain why you need the server to be a router whan you already have a router in the network you list. Only one of the NIC cards in the server can have a gateway address or the server will get totally confused as to where to send out information from itself to the internet (the 192.168.1.1 location). What is the purpose of the second NIC, since you already have the firewall/router doing the routing function?
Change the WIn2k Pro box to be the 192.168.1.4 and only use one segment for all systems, it will greatly simplify your life. Why do you want two different segments on the same hub? Form your description you only have one hub (the firewall/router) so why are you trying to run two segments on the same hub?
If you insist on using this configuration, then you must remove the gateway address from the server 172.168.1.1 NIC and turn on the IP relay function (routing) so the server will relay the IP traffic from the 172 segment to the 192 segment, where the firewall exists.
The routing function is accessed through the control panel, administrative tools, routing and remote access.
HTH,
David