1. On a laptop or smartphone connected to the hotspot, use a browser to log in http://attwifimanager/
  2. Enter the password attadmin
  3. Select Settings > Router in the left-hand menu.  Then select the Basic tab. 
  4. Click the On button next to UPnP
  5. Click Save at the bottom of the screen
  6. Reset your gaming system and see if it is connected OK now