I am using Ubuntu 10.11 with the packages samba, pptp-linux, network-manager-pptp and network-manager-pptp-gnome. I am attempting to connect through PPTP to a VPN portal on a Microsoft active directory network and according to log on the VPN server am using an unsupported protocol. I am using the System Settings Network application to add a VPN gateway using a URL for the VPN gateway, user id and password and a domain name which I had tested on a MS Windows 7 PC. I have a Wireshark file of a trace of the failed connection if that would help. I suspect that the Network application is expecting to connect to a Windows NT gateway and not an AD gateway but that is just a guess. Any information assisting with this failure will be appreciated.