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Nighthawk X4S C7800 Ethernet ports not working
Connecting Mac laptop and Apple TV using ethernet cable does not work. After logging into router, I see that all LAN links reporting status is DOWN. I troubleshooted by connecting an ethernet cable f...
Factory reset the modem.
Connect a wired PC or laptop to LAN port #4 and see if you can access the modems web page at 192.168.0.1 or 192.168.1.1.
Try each port to access the modems web page.
Be sure your using a good working and quality cable between the modem and PC.
If this doesn't fix anything, return tie modem for another one.