Windows XP and 2003 can be configured to use either PSK or X.509 Certificates in combination with L2TP. Apart from the certificate import process, configuration of both versions is practically identical. First log in as a user that has administrative access to the local machine.
Start the New Connection Wizard. You will find it at Start | All Programs | Accessories | Communications | New Connection Wizard. Click Next when the wizard's splash screen appears. From the four options presented, choose Connect to the network at my workplace and click Next.
On the next screen, select Virtual Private Network connection, and click Next. Give the VPN connection a name and click Next. Then specify the gateway, in our example aivd.xelerance.com, and click Next, and then Finish.
Connect to the VPN and fill in the username and password that was previously set in the CHAP secrets file. Save the username and password if you wish by checking the box, and specify whether...