Our company's domain controller is located in data center behind the Forefront TMG with a VPN gateway set up.
I want my Windows 7 machines to be able to work in an active directory domain environment. For that, I need to VPN into the data center's network.
How do I set up a system to make a VPN connection and then login the user?
The VPN client software is the one that comes with Windows 7. It is not a separate application, but a part of a Network and Sharing Center functionality that is pre-embedded into the OS.