After Nealls very useful info, I have now managed to get a VPN link to a friends PC running using PPTP so many thanks for that. However I now want to use L2TP instead. I have set up my Windows Server 2003 DC as an Enterprise root CA, and configured VPN ports through RRAS. There are several ports for both PPTP and L2TP. However when I set up a VPN connection on my friends PC, I keep getting a message about being unable to locate a valid certificate (Error 781 I think it is). Once a VPN connection is established using PPTP I can install a certificate on the client PC by going to http://servername/certsrv but still I get the error message. There seems to be a choice between user certificate or a client authentication certificate. Any help would be greatly appreciated.