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Update to turn off SNP features for Windows Server 2003 and Windows SBS 2003

Support for Office 2003 has ended

Microsoft ended support for Office 2003 on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Not sure if this is the right fix? We've added this issue to our memory dump diagnostic which can confirm.
Symptoms
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:
  • 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.
  • You cannot create a Remote Desktop Protocol (RDP) connection to the server.
  • You cannot connect to shares on the server from a computer on the local area network.
  • You cannot join a client computer to the domain.
  • You cannot connect to the Exchange server from a computer that is running Microsoft Outlook.
  • Inactive Outlook connections to the Exchange server may not be cleaned up.
  • You experience slow network performance.
  • You may experience slow network performance when you communicate with a Windows Vista-based computer.
  • You cannot create an outgoing FTP connection from the server.
  • The Dynamic Host Configuration Protocol (DHCP) server service crashes.
  • You experience slow performance when you log on to the domain.
  • 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.
  • You experience intermittent RPC communications failures.
  • The server crashes.
  • The server runs low on nonpaged pool memory
Note SNP features are currently not supported on Itanium-based systems.
Resolution

Update information


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

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

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

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

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Prerequisites

You must have Windows Server 2003 Service Pack 2 installed.

Restart requirement

You must restart the computer after you apply this update.

Hotfix replacement information

This update does not replace any other previously released updates.

File information

This update does not replace any files.

Workaround
To work around this problem, use any of the following three methods. You must restart the computer after you try any of these methods.

Method 1: Manually disable Receive Side Scaling and TCP Offload in the network adapter driver


To manually disable RSS and TCP Offload in the network adapter driver, follow these steps:
  1. Click Start, and then click Run.
  2. Type the following command, and then click OK:
    ncpa.cpl
  3. Right-click a network adapter object, and then click Properties.
  4. Click Configure, and then click the Advanced tab.
  5. In the Property list, click Receive Side Scaling, click Disable in the Value list, and then click OK.
  6. In the Property list, click TCP/IP Offload, click Disable in the Value list, and then click OK.
  7. Repeat steps 2 through 5 for each network adapter object.

Method 2: Update the network adapter drivers


To see whether an updated network adapter driver is available, contact the network adapter manufacturer or the original equipment manager (OEM) for the computer. The driver must meet Network Driver Interface Specification (NDIS) 5.2 or a later version of this specification.

For information about how to contact computer program manufacturers, go to the following Microsoft website:

Method 3: Manually disable RSS and TCP Offload in the registry


To have us do this for you, go to the "Fix it for me" section. If you would rather do this yourself, go to the "Let me fix it myself" section.

Fix it for me

To disable RSS and TCP Offload in the registry automatically, click the Fix this problem link. Then click Run in the File Download dialog box, and follow the steps in this wizard.



Note this wizard may be in English only. However, the automatic fix also works for other language versions of Windows. 

Note If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD. Then you can run the automatic fix on the computer that has the problem. 

Now go to the "Did this fix the problem?" section.

Let me fix it myself


Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows


To manually disable RSS and TCP Offload, follow these steps:
  1. Click Start, click Run.
  2. Type the following command in the Open, and then click OK:
    regedit

  3. Locate the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

  4. Right-click EnableTCPChimney, and then click Modify.
  5. In the Value data box, type 0, and then click OK.
  6. Right-click EnableRSS, and then click Modify.
  7. In the Value data box, type 0, and then click OK.
  8. Right-click EnableTCPA, and then click Modify.
  9. In the Value data box, type 0, and then click OK.
  10. Exit Registry Editor, and then restart the computer.
If you set the value of the EnableTCPChimney registry entry to 1, the TCP Chimney functionality is enabled. Similarly, if you set the values of the EnableRSS and EnableTCPA registry entries to 1, the RSS functionality and the TCPA functionality are enabled.
Did this fix the problem?
Check whether the problem is fixed. If it is fixed, you are finished with this article. If it is not fixed, you can contact support. To do this, go to the Microsoft Support for small business website.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Advanced information
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/IPOffloading. Specifically, these problems include the following:
  • RSS is incompatible with NAT or with Network Load Balancing (NLB).
  • 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.
  • Some TCP/IP Offload-enabled network adapters do not send TCP keep-alive messages but Exchange servers use TCP keep-alive messages to clean up inactive client sessions.
  • The TCP/IP Offload-enabled network adapter may consume lots of nonpaged pool memory. This may cause other problems in the operating system.
  • In some cases, the TCP/IP Offload-enabled network adapter may request large blocks of contiguous memory. This makes the computer crash when it tries to free the memory.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

For more information about SNP, click the following article number to view the article in the Microsoft Knowledge Base:
912222The Microsoft Windows Server 2003 Scalable Networking Pack release
In rare cases, this hotfix does not work. For example, when you use network adapter teaming software on the computer, the changes to TCP Chimney and RSS settings are not picked up by the network adapter teaming software. This causes a loss of network connectivity. After you apply this hotfix, you must verify the properties of the network adapter team to make sure that the TCP Chimney or TOE and RSS settings have also been disabled. If the hotfix cannot disable the TCP Chimney or TOE and RSS feature, you can manually disable RSS and TCP Chimney Offload by using one of the methods that is mentioned in the Workaround section.



The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
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Article ID: 948496 - Last Review: 10/09/2014 16:19:00 - Revision: 13.0

  • Microsoft Windows Server 2003 Service Pack 2
  • Microsoft Office SharePoint Portal Server 2003
  • Microsoft Office SharePoint Server 2007
  • Microsoft Windows SharePoint Services 3.0
  • Microsoft Windows SharePoint Services 2.0
  • Microsoft Exchange Server 2007 Enterprise Edition
  • Microsoft Exchange Server 2007 Standard Edition
  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange Server 2003 Enterprise Edition
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