I can definitely understand the frustration that you have when trying to view the Slingbox outside the home. Internet Viewing will allow you to view the Slingbox via the Internet but Remote Viewing would also need to be setup if you plan on viewing the Slingbox outside of the home. Here are some links that will assist you with setting up the Slingbox for Remote Viewing: Setup for Remote Viewing, What's port forwarding/port mapping?, How to use the Slingbox Network Setup Assistant to help configure your router. Hope these Help!
The Sling Moderation Team