You might not be able to connect to some of your network’s hosts after disconnecting a mobile computer such as a laptop from your corporate network, then making a PPTP connection to your corporate network. This happens because your computer is still forwarding all its network traffic to the network adapter instead of over the PPTP connection. To force your computer to forward its network traffic over the PPTP connection, disable your network adapter using the following procedure.
To Disable Your Network Adapter
1. In Control Panel, click System.
2. Click the Device Manager tab.
3. Click Network adapters.
4. Select your network adapter.
5. Click Properties.
6. In the Device usage box, select the Disable in this hardware profile check box.