[ubuntu] PPTP Connection on Ubuntu Karmic

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http://ubuntuforums.org – 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? (HowTos)