What should I do if I cannot log in to the AC1600 modem router?

If you cannot log in, make sure the computer is connected to one of the four Ethernet LAN ports or over WiFi to the modem router. Verify the Power LED is lit green. Try closing and reopening your browser, and clear the browser cache. If the computer is set to a static IP address, change it to obtain an IP address automatically from the modem router through DHCP, or set it to a static IP in the 192.168.0.2–192.168.0.254 range.