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I just got a G34 Surfboard modem today. I had xfinity assist me on setup. I had mistankenally given them the WAN MAC address for activation. I was able to get to the modem to work but it had given me a local address of 169.xxx.xxx I corrected MAC this with xfinity but, still can not get anything but, a local IP address of 169. Because of this I can not asses the web admin page.

 

I am using a Mac running Sonoma. I tired reseting my network, followed by a restart. This did not work to resolve this issue. I had tried reset of all caches as well with no success as well. 

For modem activation you need to provide the HFC MAC address mentioned on the modem label not the WAN MAC address. so please do contact your Internet service provider to activate your modem by providing the HFC MAC address mentioned on your modem label. 

Just to test the modem settings page you can access GUI without connecting coax cable to the modem.

Also could you please help us with the error that you can see while accessing modem GUI.