After several hours of troubleshooting with Xfinity Support, this modem has never connected to the internet since it arrived. Xfinity confirms the device is activated, there is a signal to the modem, but "there is no internet access". They told me that the modem is defective. I've been using the Motorola SB6141 for 6 years and have never had any problems. Now that Xfinity no longer supports DOCSIS 3.0 I decided to upgrade my modem and this one was disappointing. Given all the rave reviews of this modem on the internet, I may have stumbled upon an accidental faulty device. We return it and buy a Motorola SB 8200 series.
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