xrdp on Fedora 13

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I followed the steps and in the nice tutorial thread at
http://forums.fedoraforum.org/showth...72#post1420272 I am able to access my linux using remote desktop provided with with windows 7 when I am inside my lan.
I have a Netgera router with firewall where I allowed the port 3389 (TCP/UDP) on my firewall and would like to know how/what parameters to use to connect from outside the network.
I did some tests using the IP, ip + port 3389, it didn't work.
Thanks for your help