Slow RDP into Windows Server 2003 SP2 x64 using Vista 64

Brand new server
Windows Server 2003 SP2 x64 Enterprise Edition

Client
Windows Vista Ultimate x64

Before upgrading to SP2 on my server, I could RDP with no issues. After SP2 was installed, RDP was such a dog. It took time to login to the server, and moving around was very hesitant. I went to the console and the machine was fine, no processor hits, memory was okay, and the HD wasn’t fluttering. When connecting with an XP box, or from another 2003 server, I didn’t see this issue…

After doing alot of research, I found out you need to disable ‘receive windows auto-tuning’ on Windows Vista. This feature supposively enchances TCP to receive data more efficiently. But in our case with RDP, it’s not good.
The command for doing this is.
netsh interface tcp set global autotuninglevel=disabled

Instantly, RDP from a Vista x64 client into Windows Server 2003 SP2 x64 worked with no hesitation.

If you need to reenable this in the future, the command is.
netsh interface tcp set global auto

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