Apple TV unable to Sign On

I can't sign onto Apple TV on my X1 DVR box. The box is compatible. I am able to see the sign on area in the top left-hand corner of the screen. When I try to sign on the message says "Something went wrong. There was a problem connecting. Try again." I click try again many times and still cannot sign on. I have reset, restarted and disconnected the box multiple times as well but still have the issue. I have two other non-DVR boxes, which I could sign onto Apple TV on .Please advise what the issue maybe for the DVR box. 
. Thank you.