Did you try changing to a higher port? Remember, you'll also have to change the port allowed through your software firewall as well.
If that didn't work then I don't know
Someone else might have a few more ideas... keep an eye on this thread. If nobody's answered in a day or so, bump the thread!

*If you have a look at LOTR's posts in the third link I gave you (post #2), he gives some port numbers to try!