I wonder if this was related to the VPN client issue that I had to work around with the SonicWall VPN client a while back... I was on tech support with them, and they gave me a specific work-around of certain numbers to change in the VPN client configuration screens. Don't have that information handy right now, but this is sounding familiar. The main thing was that I didn't have to change the windows network configuration, just the sonicwall client configuration.