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Tuesday, May 12, 2009

How to disable Windows Scalable Networking Pack Components

Description
Scalable Networking Pack (SNP) is enabled by default as part of installing Windows Server 2003 Service Pack 2. SNP can be used, under specific circumstances, to improve network performance. Most environments, however, do not have SNP capable network adapters/drivers. This can result in unexpected network problem which is why it is recommended to disable SNP unless a server can benefit from it. For Domain Controller, it is recommended to disable this feature.

Resolution
To disable SNP, modify certain this registry values:
HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
Value: EnableTCPChimney
Value: EnableRSS
Value: EnableTCPA
Data: 0 or 1
Each component can be individually enabled or disabled. Set the value to "0" to disable it.

1 comment:

Rameumptom said...

Just modifying the registry did not completely disable SNP for our servers. I had to modify the nic configuration turning off any of the following:

checksum offload
offload engine
receive side scaling
large send offload

After modifying these nic properties SNP was then successfully turned off on our servers

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