Having the same problem that everyone else seems to have. I can no longer log into the Xfinity TV Stream on my computer. I've called, but keep getting told that it's a problem with my computer even though I know it isn't. I finally got someone to look at it about a week ago, and it was working until day before yesterday.; Now getting the same infuriating message as everyone else.
"Sorry, we've run into a problem. The good news? We can take care of it right now. First, you'll need to sign out of your account. When you sign back in it'll be fixed. Ready? (Error TVAPP-00170) Sign Out" The "Sign Out" is a button, which when clicked, signs out and leaves me at the home page from which I try to sign in again, which repeats the process with no change.
Please fix your servers as soon as possible and please email me or message me about what you can do and when it will be.