After you install Windows Server 2003 Service Pack 2 (SP2) or Windows Server 2003 Scalable Networking Pack (SNP) on a computer that has a TCP/IP Offload-enabled network adapter, you may experience many network-related problems.
The following issues may occur when Windows Server 2003 SNP is turned on:
1. When you try to connect to the server by using a VPN connection, you receive the following error message:
Error 800: Unable to establish connection.
2. You cannot create a Remote Desktop Protocol (RDP) connection to the server.
3. You cannot connect to shares on the server from a computer on the local area network.
4. You cannot join a client computer to the domain.
5. You cannot connect to the Exchange server from a computer that is running Microsoft Outlook.
6. Inactive Outlook connections to the Exchange server may not be cleaned up.
7. You experience slow network performance.
8. You may experience slow network performance when you communicate with a Windows Vista-based computer.
9. You cannot create an outgoing FTP connection from the server.
10. The Dynamic Host Configuration Protocol (DHCP) server service crashes.
11. You experience slow performance when you log on to the domain.
12. Network Address Translation (NAT) clients that are located behind Windows Small Business Server 2003 or Internet Security and Acceleration (ISA) Server experience intermittent connection failures.
13. You experience intermittent RPC communications failures.
14. The server stops responding. The server runs low on non paged pool memory
15. 32 MAPI sessions exceeded (9646 errors) causing the inability for Outlook clients to connect to the Information Store. This can occur more frequently with VPN connected clients and we have also seen scenarios where Exchange 2007 is affected with Windows 2003 SP2 installed as well.
16. You cannot connect to shares on the server from a computer on the local area network.
17. You cannot connect to Microsoft Exchange Server from a computer that is running Microsoft Outlook.
18. You can only connect to Web sites that are hosted on the server or on the Internet by using a secure sockets layer (SSL) connection. In this scenario, you cannot connect to a Web site that does not use SSL encryption.
19. You experience slow network performance.
20. You cannot create an outgoing FTP connection from the server.
21. You experience intermittent RPC communications failures.
22. Some Outlook clients may be unable to connect to Exchange.
23. You cannot run the Configure E-mail and Internet Connection Wizard successfully.
24. Microsoft Internet Security and Acceleration (ISA) Server blocks RPC communications.
25. You cannot browse Internet Information Services (IIS) Virtual Directories.
26. Non-paged pool memory leaks caused by having the Chimney feature enabled. Sometimes you can't even start the IIS services when Non-paged pool gets below 20MB.
27. The Inability to logon to Outlook Web Services or even IIS for that matter, either locally or remotely.
28. Networking throughput is decreased when these features are turned on. This is the opposite of what the Networking Pack is supposed to do.
29. Cluster ISAlive checks fail randomly
30. TCP Connections are reset when RSS is enabled.
31. TCP port exhaustion
32. After you install the Scalable Networking Pack (SNP), a Windows Server 2003-based computer may stop responding during shutdown or during hibernation. When this problem occurs, the computer does not respond to the ping command.
To work around this problem, disable the TCP Chimney Offload feature. To do this, run the Netsh int ip set chimney DISABLED command at a command prompt.
Install the hotfix mentioned in MS KB 948496