Connecting to vpn from behind a router (with dynamic IP)

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http://serverfault.com – I've made a pptp server on Ubuntu and considering I'm fairly new at this stuff I somehow made it work (tested from a friend behind a router without any port forwarding). Granted it was kinda slow, but it still established a connection (connecting from Win 7). Now the idea is that I want to connect to my home network from Germany (for example to be able to see the other HALF of youtube, which is blocked here for some unknown reason). But when I got here it turned out I can't connect (error 619). After I've read a bit about it I'm guessing my ISP is blocking the ports needed by the pptp and I r (HowTos)