Scientific Atlanta: Xbox won't connect to wireless modem

Scientific Atlanta (Modems/Gateways): Xbox won't connect to wireless modem
Error message says can't recognize mac address

:)

 

Xbox One "disconnecting" my router/cable modem when I shut it down

Yes, the modem is Scientific Atlanta 2100. The Xbox One is plugged directly into the wall.

 

Xbox One "disconnecting" my router/cable modem when I shut it down

Thanks. I have a wireless connection to the Xbox One using a Scientific Atlanta cable modem (via Cox) and D-Link router (Model Dir-628). My wifi works fine while gaming/watching movies etc. on my Xbox One. The connection works with other devices even after
I've shut the Xbox One off, but when I unplug it from the outlet then the wifi freezes until I unplug/plug the modem and the router.