OK, running that software confirms your suspicion that it's something to do with the NIC or the TCP/IP stack on the Win2k box. What NIC is it?
The logging on the Receiver is output over serial. Unless you:
a) want to open up your Receiver
b) want to build the relevant level-convertor board
c) want to put together the correct cable.
...you'd better forget about that one
.
You can get some logging out of the server by running
armgr /log:armgr.log
At this point, I'm suspecting some kind of firewall, other than the Norton stuff you've removed. Do you have any port-blocks set up in Win2k itself? To find out:
Control Panel -> Network Connections -> Local Area Connection -> Properties/General -> TCP/IP -> Properties -> General -> Advanced -> Options -> TCP/IP filtering -> Properties.