Disable TCP/IP Auto-Tuning in Windows Vista
Windows Vista has a new feature called "Receive Window Auto-Tuning" which is supposed to optimize network performance automatically. With certain routers, however, this feature can actually cause network problems, causing performance problems and in some cases even system crashes.
To determine if you’re affected, run the Internet Connectivity Evaluation Tool from Microsoft’s website. If your router cannot support this feature of Vista you can either buy a new router or disable Receive Window Auto-Tuning.
To do this:
1. Launch a command prompt as an administrator. (Start > Programs > Accessories > Command Prompt (right-click and choose Run as Administrator)
2. Enter the following command:
netsh int tcp set global autotuninglevel=disabled
If you need to enable the service again, use:
netsh int tcp set global autotuninglevel=enabled
