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I'm currently struggling to to find any documentation about "TcpWindowSize" in Windows Vista. I really hope it still works when "Receive Window Auto-Tuning" is disabled. AutoTuning currently actually has a far greater chance of completely messing up a connection than tuning it "better, faster, and more efficiently" (which indeed is its intended purpose) since a lot of routers and network-components simply don't know how to deal with it. A lot of routers with statefull inspection firewalls will have serious problems dealing with Autotuning (e.g. most - if not all - current Draytech routers). The result is packet loss, blocked connections and severely reduced network performance. I'm having a different problem though. I'm using a KISS DP-1500 networked DVD player to stream videos and music into the living room. With AutoTuning in its "normal" setting it is simply impossible to get a stable stream to this client. And it looks like this happens on all Vista installations with a lots of similar streaming clients. While I simply cannot use the AutoTuning feature (or at least not until I can afford a better streaming client) in "normal" mode I'd still like to adjust the Receive Window manually. I'm also wondering where the default value that AutoTuning bases its analysis on is set and if this might still be "TcpWindowSize". Update: I just answered my own question: http://www.microsoft.com/technet/community...guy/cg1105.mspx