VPN Authentication failed
I have vpn set up at vpn.whitefamilyserver.com, and a user made for services only. I log in both with PPTP and L2TP. On L2TP it fails to connect unless I'm on the wifi of the VPN, and on PPTP it either gets disconnected, but most of the time it says Authentication failed, even though I'm 100% sure both the username and password is correct.
How can I get the authentication to work? Or L2TP over the internet?
MacBook Pro with Retina display, OS X Mavericks (10.9)