I can't believe your title sentence!
I just said that exact same thing several hours ago!!!!!!!
I do have a post in here describing my identical situation.
But upon extensive surfing around the site, I see that
other users have been shut out also, but are trying
fruitlessly to connect.
They try to change settings and refigure things
but its useless because something or someone at the Sling server
has tweaked some code that doesn't work.
There's nothing wrong with our settings.
We suffered through a similar experience last fall.
The part I don't understand is what the holdup is in fixing these
ridiculous problems, or fixing them QUICKLY.
They offer the same old answers that has us
spooling around to dead ends.
I too wanted access to my TV/DVR in the coming weeks.