Microsoft KB Archive/927168

= TCP traffic stops after you enable both receive-side scaling and Internet Connection Sharing in Windows Vista or in Windows Server 2003 with Service Pack 1 =

Article ID: 927168

Article Last Modified on 11/14/2006

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APPLIES TO

 Windows Vista Home Basic Windows Vista Home Premium Windows Vista Business Windows Vista Enterprise Windows Vista Ultimate Microsoft Windows Server 2003 Service Pack 1, when used with:  Microsoft Windows Server 2003, Standard Edition (32-bit x86)

 Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)</li></ul>

 Microsoft Windows Server 2003, Web Edition</li></ul> </li></ul>

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SYMPTOMS
After you enable both receive-side scaling and Internet Connection Sharing, TCP traffic stops. For example, the ping command does not work.

This problem occurs when this computer is running one of the following operating systems:
 * Microsoft Windows Server 2003 with Service Pack 1 (SP1) and the Microsoft Windows Server 2003 Scalable Networking Pack installed
 * Windows Vista

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CAUSE
This problem occurs because receive-side scaling and Internet Connection Sharing are mutually exclusive.

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RESOLUTION
To resolve this problem, disable either receive-side scaling or Internet Connection Sharing. Do not enable both receive-side scaling and Internet Connection Sharing at the same time.

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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

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MORE INFORMATION
To determine whether receive-side scaling is enabled in Windows Vista, type the following command at a command prompt:

netsh interface tcp show global

Output that resembles the following will appear: Querying active state...

TCP Global Parameters --   Receive-Side Scaling State          : enabled [...] To disable receive-side scaling, type the following command at a command prompt:

netsh interface tcp set global rss=disabled

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