Ihave the rest of the set up completed and have used the box successfully for years. I have changed the operating system and have a new dual band VIZIO router but can view at home and have forwarding setup at IP 192.168.1.254. I have tried the IP at .237 with short success but nothing will remain accessble. I am wondering if the box has just failed and it's time to get a new one, which I'll do because I love the service but want some indication that if I spend anothe $200 and won't have the same problem.
It seems to be an issue only with the Internet Viewing since you are able to connect to the Slingbox locally, I don't think the issue is with the Slingbox. Probably the modem has a private IP instead a public one so I recommend that you check the network settings to determine if you also need to setup the modem, you can check this link;
Let us know how it works
Try assigning an internal "static ip address" to the slingbox from within your router. If your router assignes the first available internal IP address each time to the slingbox when you try to connect, it will cause loss of conectivity since the port 5001 rule it needs was designated to a different address then what it now obtains. This is most likely the cause of the issue.
You'll have to assign the same internal static ip address in both the slingplayer setup assistant as well as the router itself in order for this to resolve your problem.