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We recently upgraded a dozen of PCs to new hardware and Windows 7 professional (before we had XP), but we are experiencing many newtwork issues, for example SSH sessions (using Putty) stops working after a while.

Checking the LAN with various testing tools doesn't report any issue. We have no XP PCs anymore for testing, but a pair of MACs do work fine.

I wonder if this is a known Windows 7 issue, and how can be fixed.

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Try disabling TCP receive window autotuning:

netsh interface tcp set global autotuning=disabled
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Thanks, we'll do some testing later today. – UVL Sep 26 '11 at 10:57

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