maybe if you get crazy with some kind of port proxying or nat settings or something.. because the port will be the same between both points, so as soon as you go outside your router(which you'd need to do to check it from the internet side) and try to come back in, then you have 2 machines(or even just the same machine but different processes) trying to use the same port.
do you do irc? you can pop into irc.freenode.net/videolan and get someone to check it out..