Thanks for using our forums. Sorry to hear you are having issues connecting to your Slingbox outside the network. In order to connect to the Slingbox outside the network, you will need a static IP address. Which type of Slingbox do you have? The 350 and 500 should automatically set up the Internet Viewing as long as UPnP is enabled in your router. With the older units, you would need to manually set the port forwarding to be able to view outside the network. You would need to set the static IP address (since with dynamic, the IP changes every time the Slingbox tries to connect) and port (5001, 5002, 8080, or 443). You can also follow the website www.portforward.com for more help.
Hope this helps,
The Sling Moderation Team