More Information on AutoTuningLevel and the Vista TCP Window Scaling

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I first introduced this issue in a previous post.  It turns out that this problem occurs if a network hardware device, such as a router, does not support TCP Window Scaling. TCP Window Scaling is a new Windows Vista feature. 

The TCP window scale option is an option to increase the TCP congestion window size above its maximum value of 65,536 bytes.

I also have found that this can resolve problems like slow file copy operations in Vista as well as momentary loss of Internet connectivity.

Here are a couple of knowledge base articles from Microsoft:

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