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Swapping Out (Third Party) Modem with New (Third Party) Modem--No Connectivity
I bought an approved third part modem that came today and I attempted to connect it. All of the lights come up correctly, but I'm not getting any internet connectivity. Is there something I have to do on the Xfinity/Comcast website to get it to recognize my new modem, or should that be automatic?
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EG
Expert
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86.6K Messages
1 y ago
Connect it to the coax line and power it up. Let it fully sync up with the system ("DS, "US", and the "Online" lights are steadily lit). Connect a computer to it and open up a browser. You *may* see their "Walled Garden" modem self registration page. If so, follow the screen prompts. Have your mobile telephone number, your Xfinity username and password or the account number and telephone number associated with your Comcast account handy.
If not, try calling 1-855-652-3446. That is their device activation line.
If that doesn't work for you, you can call 1-800-comcast and tell a rep that you would like to have a new modem provisioned for service. Have the RF / CM / HFC MAC address and the serial number of it handy when you call.
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