Unless things have changed, the Xfinity Stream Beta App only works if you have an Xfinity modem.
moved your reply on a long dead thread to a new thread. The xfinity stream beta appp works on customer-owned gateways/modems, too.
Have the same problem. Have used xfinity stream with no problems for many months (have net gear modem router) on Samsung smart tv, android tablet, and ipad mini. Got flex box for a trial, what a mistake! Comcast changed my account and took away xfinity stream. Got rid of flex box and corrected account settings. Now xfinity stream only works on Samsung android tablet. Others get not on home wifi, tv is erratic a d freezes. Spent hours on phone with tech, no help. What happened? How to correct?