Here are recent KB articles that relate to networking technologies in Windows Server 2003:

http://support.microsoft.com/?kbid=945466
You receive a Stop error message when a computer that is using a TCP/IP Offload Engine (TOE)-enabled adapter is running under low resources in Windows Server 2003
2/1/2008
Windows Svr Ent 2003 EN

http://support.microsoft.com/?kbid=943665
A Windows Server 2003 Service Pack 2-based computer may drop packets when the computer is working as a bridge and as a router
1/31/2008
Windows Svr Ent 2003 EN

http://support.microsoft.com/?kbid=947775
On a Windows Server 2003-based computer that has a TCP Chimney Offload network adapter, the TCP data stream may be corrupted when the network adapter indicates an MDL chain whose starting MDL has a nonzero offset
1/31/2008
Windows Svr Ent 2003 EN

http://support.microsoft.com/?kbid=947773
A Windows Server 2003-based computer responds slowly to RDP connections or to SMB connections that are made from a Windows Vista-based computer
1/28/2008
Windows Svr Ent 2003 EN