This may be the answer:
http://technet.microsoft.com/en-us/l...c747461.aspx::
Cause: The version of Connection Manager that is included with Windows
SBS is
> not compatible with 64-bit editions of Windows Vista."
Solution: Manually configure a VPN connection and then use Remote
Desktop Connection to remotely access the Windows SBS network from a
client computer that is running the 64-bit edition of Windows Vista.
To create a VPN connection from a 64-bit client computer that is running
Windows Vista to the server