Setup for Slingbox Internet Viewing

I have a Slingbox Pro HD and have set up my Actiontek PK5000 router for port forwarding.  The IP of my Slingbox is 192.168.0.254 and I have forwarded port 5001 according to Sling's instructions but can't get Internet viewing to work.  Does anyone else have problems with the Slingbox setup?  Could I get some help with how to configure NIS 2012 to work with port forwarding?  The rule I have written under "Network Settings, Smart Firewall, Advanced Settings, Configure, General Rules: Allow, In/Out, 192.168.0.254, sling.com, Communications: Any, TCP and UDT" does not seem to work.  Any guidance will be much appreciated.