Having experimented a bit more, I am able to connect to a Draytek Vigor 2950. The Draytek connection appears to work regardless of the options above, i.e. with or without the changes to settings that are required by the MS PPTP server.
Having experimented a bit more, I am able to connect to a Draytek Vigor 2950. The Draytek connection appears to work regardless of the options above, i.e. with or without the changes to settings that are required by the MS PPTP server.