The specified port does not have a means to store password authentication information in /etc/NetworkManager/system-connections. In essence, this means an automated global connection to a PPTP VPN cannot exist until a user trusted with the password information activates it.
Could you try 0.7.999 to see if this has been fixed now?
No information received from user for over 6 months. Closing now. Please re-open if you need any more help.