If you're using WOW Ultra with the Arris media gateway there is a way to setup the port mapping. Try logging in to the router setup by typing the router IP address which should be '220.127.116.11'. Then go to the Firewall tab and setup a port range of 5000 to 5005 in the 'Virtual Server' and 'Port Triggers' options. Enter the IP address of your Slingbox and for 'type' select 'Both'. I tried a lot of different things and finally got it work with this setup. Good luck.