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I have a new arris SB8200 and xfinity. I attempted activating through the xfinity app but it said it could not connect to device. The power, send, and internet lights were solid green and receive light was solid blue. I got on xfinity chat and they had me do a bunch of stuff but always ended with same configuration of lights. When plugging in router, was showing no internet. I tried going to the IP address on my laptop but no luck. My laptop does not have an Ethernet port so I don’t have the option to plug directly into modem. When I went back to my old modem, everything worked fine. Trying to figure out next steps before I return this modem. 

On the sb8200 the light status looks promising, check if you can see a flashing orange or green at the back of the ethernet port, also only one port can be used for the Wi-Fi internet.

Try to activate the modem by providing an HFC MAC ID to Xfinity,

Try doing a Power cycle,(unplug the power and  co-axial cable wait for 30 seconds, and plugin back the co-axial and power cable) download the Xfinity App, and try to activate it 

If unable to activate then try doing a Reset and activate again with Xfinity App.

Do arrange for an ethernet port computer/laptop to check if the modem can provide a valid IPV4 address. 

 

 

 

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