You must add the VPN device to RAS after installing PPTP. Follow these steps to add a VPN device on a computer running Windows NT Workstation version 4.0.
To configure a VPN device on the PPTP client
1. Click Start, point to Settings, and then click Control Panel.
2. In Control Panel, double-click Network.
3. Click the Services tab and select Remote Access Service.
4. Click Properties to display the Remote Access Setup dialog box.
5. Click Add. The Add RAS Device dialog box is illustrated in the following figure.
6. Click the RAS Capable Devices list to display the VPN devices that must be added and configured as a port and device in RAS.
7. Select the VPN1 - RASPPTPM device, and then click OK. (If you installed PPTP with more than one VPN device, repeat steps 5, 6, and 7 until all the VPNs are added to the Remote Access Setup dialog box.)
8. By default, the VPN device on a computer running Windows NT Workstation version 4.0 is configured to dial out only. Select the VPN port and click Configure. Verify that the Dial out only option in the Port Usage dialog box is the only option selected, and then click OK. This returns you to the Remote Access Setup dialog box.
9. Click Network to display the Network Configuration dialog box.
10. Verify that the TCP/IP option in Dial out Protocols is the only option checked, and then click OK.
11. Click Continue.
12. Close Network, shut down, and then restart the computer.