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I have a Arris SBG6900-AC modem. I have Xfinity as of yesterday. It worked until last night when I had to restart the modem, which brought it back up. Today the modem doesn't show my network's. What can I do?

Check on the Xfinity app whether it shows your modem is online or offline. If its online perform hard reset on the modem then check for WIFI and internet or if the modem shows offline please try reactivating modem on the Xfinity app or by contacting your Internet service provider. But after resetting the modem will go to default setup any custom settings will be removed so use the default network name and password to connect to your network. 

http://arris.force.com/consumers/articles/General_FAQs/SBG6900-AC-v1-5-x-Factory-Reset

 

http://arris.force.com/consumers/articles/General_FAQs/SBG6900-AC-v1-5-x-Changing-the-Wireless-Network-Name-SSID

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