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• Check to see that the IP address of your modem router is listed as the default router in your computer. If the IP
configuration of your computer is assigned by DHCP, this information is not visible in your computer’s Network
Control Panel. Verify that the IP address of the modem router is listed as the default router.
• Check to see that the network address of your computer (the portion of the IP address specified by the netmask)
is different from the network address of the remote device.
• If your ISP assigned a host name to your computer, enter that host name as the account name. For more
information, see one of the following sections:
• Specify an ADSL Connection Without a Login on page 50
• Specify a VDSL Connection Without a Login on page 59
• Specify a Cable or Fiber Connection Without a Login on page 68
• Your ISP might be rejecting the Ethernet MAC addresses of all but one of your computers.
Many broadband ISPs restrict access by allowing traffic only from the MAC address of your modem, but some
additionally restrict access to the MAC address of a single computer connected to that modem. In this case,
configure your modem router to clone or spoof the MAC address from the authorized computer. For more
information, see one of the following sections:
• Manually Set Up an ADSL Internet Connection on page 50
• Manually Set Up a VDSL Internet Connection on page 59
• Manually Set Up a Cable or Fiber Internet Connection on page 68
Troubleshooting
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Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800