Wifi Led Is Off; You Cannot Log In To The Modem Router; Troubleshoot The Internet Connection; Troubleshoot The Dsl/Internet Link - NETGEAR Nighthawk X4S D7800 User Manual

Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800
If the error persists, a hardware problem might exist. For recovery instructions or help with a hardware problem,
contact technical support at netgear.com/support.

WiFi LED Is Off

If the WiFi LED remains off, check to see if both radios on the modem router are disabled (see
Radios on page 115). By default, both radios are enabled and the WiFi LED lights solid white.

You Cannot Log In to the Modem Router

If you are unable to log in to the modem router from a computer on your local network and use the modem router
web pages, check the following:
• If you are using an Ethernet-connected computer, check the Ethernet connection between the computer and
the modem router.
• Make sure that the IP address of your computer is on the same subnet as the modem router. If you are using
the recommended addressing scheme, your computer's address is in the range of 192.168.1.2 to 192.168.1.254.
• Make sure that your computer can reach the modem router's DHCP server. Recent versions of Windows and
Mac OS generate and assign an IP address if the computer cannot reach a DHCP server. These autogenerated
addresses are in the range of 169.254.x.x. If your IP address is in this range, check the connection from the
computer to the modem router and reboot your computer.
• If your modem router's IP address was changed and you do not know the current IP address, use an IP scanner
application to detect the IP address. If you still cannot find the IP address, clear the modem router's configuration
to factory defaults. This sets the modem router's IP address to 192.168.1.1. For more information, see
the Modem Router to Its Factory Default Settings
• Make sure that Java, JavaScript, or ActiveX is enabled in your browser. If you are using Internet Explorer, click
the Refresh button to be sure that the Java applet is loaded.
• Try quitting the browser and launching it again.
• Make sure that you are using the correct login information. The user name is admin, and the default password
is password. Make sure that Caps Lock is off when you enter this information.
• If you are attempting to set up your modem router behind an existing router in your network, set up the modem
router as a WiFi access point (see

Troubleshoot the Internet Connection

If your modem router cannot access the Internet, check the DSL connection, then the WAN TCP/IP connection.

Troubleshoot the DSL/Internet Link

If your modem router is unable to access the Internet, first determine whether the DSL, cable, or fiber link with the
service provider is working. The DSL/Internet LED indicates the state of this connection.
on page 221 and
Set Up the Modem Router as a WiFi Access Point Only
Troubleshooting
286
Factory Settings on page 295.
on page 252).
Control the WiFi
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