VPN PPTP What is wrong?

Hi,

I have followd a tutorial to setup PPTP on my mikrotik.
But I still can’t connect wint my windows VPN client to it.
What is wrong?
Do I need Firewall rulles to open PPTP?
How?
I followed this tutorial: http://www.youtube.com/watch?v=YRByWKO0kM4

TCP Port number=1723
Protocol=GRE (value 47)

Firewall must allow those. If you are still having issue please /print what you have done and post it here.