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Go to programs, accessories then right click command line and select run as administrator.
At the prompt type
netsh interface tcp set global autotuninglevel=disable
Vista: TCP window scaling not compatible with some network hardware.
There is an incompatibility between Microsoft Windows Vista and some network equipment. Equipment possibly affected includes: Routers, VPN Endpoints, and Firewalls that use Stateful Packet Inspection (SPI).
Among most commercial firewalls that utilize Stateful Packet Inspection, the OSU Fire Marshall is one that is affected by this issue.
The problem has to do with the TCP window resizing feature in Vista and Stateful Packet Inspection. Possible symptoms exhibited include:
To disable TCP Windows Scaling In Vista:
netsh interface tcp set global autotuninglevel=disabled
To verify the settings on the workstation, use the command:
netsh interface tcp show global
The results of this command should be: