IPTables is blocking the GRE protocol.
When i install firestarter and add the external IP address of the server I want 
to connect to and also add the internal ip address of the server (which I 
should be able to connect to after a successfull VPN connection) to firestarter 
as that those addresses are allowed to connect to my machine, then I get this. 
I think that Network Manager PPTP Plugin is not adding a route or not adding 
the appropriate rules to iptables to allow any connection through the vpn 
tunnel. I am however not experienced enough with iptables to check this and 
potentially fix this with a script.

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[feisty] VPN over PPTP with NetworkManager connects but can not be used beyond 
connection
https://bugs.launchpad.net/bugs/110709
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