I have prepared a configuration example Raspberry Pi as a PPTP VPN client.
Unfortunately, at the moment I do not have Raspberry Pi and I would ask someone to test my configuration.
Description is in Polish, but it's probably not a problem
http://www.vpnonline.pl/konfiguracja/raspberry-pi-pptp
If the link to my site is prohibited, I can paste the entire code
We provide an account for VPN testing.
If anyone would like to take a moment to configure and test it, please contact us at the email or PM.
Thank you.