I am having the same issue with My linksys router, i am wondering if you are just having this problem, My sling box has been fine for years until this week i tried watching on my iphone today and no connection. So when i got home i checked that it was set up right as far as for internet viewing and o course it was no longer there so i went in to settings to reset this and now all of a sudden it no longer works with my router.
WHAT THE **** DID SLINGBOX DO IN THE LAST UPGRADE TO MAKE THIS HAPPEN?
I tried everything i am very tech savy however they did something!
Wheres the help?
Use the following links in order to get a guide on how to enable the Internet Viewing manually on your Slingbox, there for you will be able to watch it away from home.
I hope that helps!