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Is there a way to manually set the receive window size (RWIN) in Windows Server 2008 R2 after disabling the "Receive Window Auto Tuning" feature?

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It would be interesting to hear why you are disabling auto tuning on 2008. – Doug Luxem Feb 16 '11 at 17:15
@DougLuxem: Not sure if I am going to even do it yet. But see… . – Kyle Brandt Feb 16 '11 at 17:21

It looks like it can be manually set, but Microsoft is only exposing it through Socket-Options. Which means specific applications opening sockets can set it, but you can't set it on an adapter like we used to do with Server 2000/2003.

A big hint on one of the 'best practices analyzer' errors. Apparently the TcpReceiveSize is ignored by 2008R2.

Down there at the end of the document is a section on doing some tcp testing with Server 2008. They use a specific utility, NTttcp, to do benchmarking. One of the options on that tool is to set window size options.

For IIS, you might be able to set a registry key to tell it to use a different value for that ( I don't know if that works for IIS7 or not.

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