Hi, If you are still looking for a VPN Service I use a VPN Service that has OpenVPN Servers which are setup specially for use with Dreamboxes.
By using these VPN Servers I can connect to my XXcam server on the internet bypassing blocks put in place by my ISP.
look here:-
www.thevpnstore.com/hobby.html and they will help you set it up.
Good luck.
James.