RRAS on Windows 2008 R2

I always use MS remote access server(in Routing and Remote Access, RRAS) to test a simple VPN connection. Running and connection RRAS on Windows 2003 is very straightforward, however the connection to RRAS on Windows 2008 R2 never succeeded

If I selected "PPTP VPN" as the type of VPN

The connection attempt failed immediately with Error Code 678.

With this symptom, I soon realized that, unlike on Windows 2003, WAN Miniport(PPTP) must be configured manually on Windows 2008.

Open RRAS which is installed by adding a server role called "Network Policy and Access Services" on Windows 2008. Select "Ports" at left pane, you will notice there is only one "WAN Miniport(PPPOE)" configured(at right pane).

Right click "Ports", then select "Properties", you get

In devices list, select "WAN Miniport(PPTP)", then click "Configure..." button,

At least check the option "Remote access connections(inbound only)"

Now you can see there are a few WAN Miniports(PPTP) waiting to be connected!