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How to disable SackOpts (Selective Acknowledgements) in Windows 7

I am trying to figure out how to disable / toggle Selective Acknowledgements (SackOpts) in Windows 7?

Any ideas?
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David Johnson, CD
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ASKER

Thanks. We've tried this one already with no luck.

Unfortunately, the SackOpts key does not exist at HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters in Windows Vista or Windows 7.

We did try to manually add the key and set it to '0' with no joy.
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ASKER

ended up using a windows xp machine to troubleshoot the issue