Hi, I need help getting a standard PPTP VPN connection working. I have the Network Manager plugins installed, and have in the past connected to this VPN fine but now (since upgrading to Karmic) I get errors relating to GRE protocol.

I've had it confirmed at the server end that GRE is enabled/set up etc and if I use another PC (Windows) on the same network as my laptop it connects fine but my laptop does not.

Is there some config file or setting I can change to allow the GRE protocol?