Windows 2003 Server RC2 SP2
3COM 3C940 GB Onboard NIC

I recently installed 2003 server. Got the latest updates. I then set up this
machine as a domain controller on a new forest and followed the the
instructions to set up the DNS. Now if I try to do anything over the
interent, I am lucky to get a full page to load. There seems to be all kinds
of communications problems. If I stop the DNS and point everything over to
my old server which I want to decomission when this one is up and running,
all network performance is perfectly fine.

Any thoughts?