Which App are you using? The new Dish App, or the one Mike created? Mine does the same thing when I used Mikes App. All I had to do was select my other DVR or select grid or something else from the drop down on the top right hand side, the reselect my DVR and it connected to it then.
Its not accessible on the actual Dish app or my computer. They were at a loss on the tech chat last night. Told me everything seems good. They did not understand how it could call home and download content, but not work in remote access. My guess is that my account is screwed up somehow on their end.
There have been no changes to my home network and the box gets ip just fine.