Friday, December 9, 2011

How to disable default SNP feature in windows 2003 server

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.

15. The server runs low on nonpaged pool memory

These issues occur because of several problems with the Windows Server 2003 SNP features that are enabled in Windows Server 2003 Service Pack 2. These features include Receive Side Scaling (RSS) and TCP/IP Offloading. Specifically, these problems include the following:

1. RSS is incompatible with NAT or with Network Load Balancing (NLB).

2. TCP/IP Offload has a problem with the Window Scaling feature. This problem typically occurs when you communicate with a Windows Vista-based computer. Windows Vista uses the Window Scaling feature.

3. Some TCP/IP Offload-enabled network adapters do not send TCP keep-alive messages. However, Exchange servers use TCP keep-alive messages to clean up inactive client sessions.

4. The TCP/IP Offload-enabled network adapter may consume lots of nonpaged pool memory. This may cause other problems in the operating system.

5. In some cases, the TCP/IP Offload-enabled network adapter may request large blocks of contiguous memory. This makes the computer stop responding when it tries to free the memory.
You must be running with service pack 2 on windows 2003 server, please check the type of OS it applies to.
Update information

This update turns off default SNP features. After you install this hotfix, you can manually re-enable these features by modifying registry values. The following files are available for download from the Microsoft Download Center:

Download the update for Windows Server 2003, x86-based versions (KB948496) package now.
Click Here  

Download the update for Windows Server 2003, x64-based versions (KB948496) package now.
Click Here

Download the update for Windows Server 2003, Itanium-based versions (KB948496) package now.
Click Here

This solution is Applies to following products:

Microsoft Windows Server 2003  Service Pack 2, when used with all editions of 2003
Microsoft Office SharePoint Portal Server 2003 and 2007
Microsoft Windows SharePoint Services 2.0 and 3.0
Microsoft Exchange Server 2003 & 2007 (Standard & Enterprise Edition)

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