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