I had same problem go to www.portforward.com I can't remember how I did it but there's a link there that will walk u thru setting up your router for static IP adressess, you don't have to buy the software. If u don't do this the router assigns your computer a diff. IP address each time you boot up, I think.. If listen port was open the very 1st time this is probobaly the deal. If you are not running router, well I don't know... I'm still learnin