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ITsVISTA KB-Link: KB967224

Some TCP/IP parameters in the registry are changed to incorrect values when you use the NETSH command to modify TCP/IP global parameters on a computer that is running Windows Server 2008 or Windows Vista

When you use the netsh command to modify TCP/IP global parameters on a computer that is running Windows Server 2008 or Windows Vista, some TCP/IP parameters in the registry are changed to incorrect values.

Note: These parameters are saved in the location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

This issue may affect the following items:

  • DisableTaskOffload
  • EnablePMTUBHDetect
  • EnablePMTUDiscovery
  • KeepAliveInterval
  • KeepAliveTime
  • Tcp1323Opts
  • TcpFinWait2Delay
  • TcpMaxDataRetransmissions
  • TcpTimedWaitDelay
  • TcpUseRFC1122UrgentPointer

For example, you run the following command to change a TCP/IP global parameter:

netsh in tcp set global autotuninglevel=normal

After you run the command, the values of some unrelated settings below are changed to 0xFFFFFFFF:

  • KeepAliveInterval
  • KeepAliveTime
  • TcpMaxDataRetransmissions
  • TcpTimedWaitDelay
There is a download that resolves this issue. See Hotfixes for details.
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB967224.

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