I got an app (RDP Lite) which lets me use my PC remotely when I set the IP address to my PC's and use it at home. So it's fine internally but when I want to try it externally I try setting it to my router's IP address, provided by BT Home Hub Manager under Home Network > IP Addresses, and that doesn't work.
I know I need to configure my router to allow incoming traffic to my default port for Windows XP, 3389, but I really don't know how. I've tried a few things like letting supported applications VNC to device 'IBM…etc' and removing the firewall temporarily but I'm shooting in the dark here.
Best Answer
I was about to buy that app, but I'm a long time user of LogMeIn Free were from here (Denmark) I help my mum and dad as well plenty of friends with their computer related problems back in my home country (Portugal)
LogMeIn Free was a fantastic as free solution, no hassle with proxies, routers or anything as it works with port 80 (http traffic).
So I bought the LogmeIn Ignition App and continue to use my access to all computers that i used before. It's a bit expensive ($29.99) but I bought it within a promotion discount and works marvelous and super fast!
I can now access any windows or mac computer from my iPhone or iPad with no worries.
It's just an idea.