Requires Xfinity Internet Error on Apps

Today we started getting an error message when we try to access Apps on on main cable box.  When you select an App, say Netflix, we get an error that states:  "This feature requires Xfinity Internet".  We have Xfinity Internet and it is working fine.  This is only on the main box as all the wireless boxes access the Apps just fine.  I've rebooted the Internet, the cable box and also did a system refresh.  Help, please.