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Page 286 / 299 Scroll up to view Page 281 - 285
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
Control the WiFi
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
Return
the Modem Router to Its Factory Default Settings
on page 221 and
Factory Settings
on page 295.
•
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
Set Up the Modem Router as a WiFi Access Point Only
on page 252).
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.
Troubleshooting
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Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800
Page 287 / 299
DSL/Internet LED Is Solid White
If the DSL/Internet LED
lights solid white, the DSL, cable, or fiber connection is good.You can be confident that
the service provider connected your line correctly and that your wiring is correct.
DSL/Internet LED Is Blinking White (DSL Connection Only)
If the DSL/Internet LED
is blinking white, your modem router is attempting to make a DSL connection with your
ISP. If the modem router establishes a DSL connection, the DSL/Internet LED turns solid white. This connection
process generally lasts several minutes.
If the DSL/Internet LED does not turn solid white, disconnect all telephones on the line. If this solves the problem,
reconnect the telephones one at a time, being sure to use a microfilter on each telephone. If the microfilters are
connected correctly, you can connect all your telephones.
If disconnecting telephones does not result in a solid white DSL/Internet LED, a problem with your wiring might exist.
If the telephone company tested the DSL signal at your network interface device (NID), then wiring in your house
might be of poor quality.
DSL/Internet LED Is Off
If the DSL/Internet LED
is off , the modem router cannot connect to the Internet or to your Internet service provider
(ISP). To resolve the problem, you can try the following steps.
To reenable the modem router to connect to the Internet or your ISP:
1.
If you are using a DSL connection to your ISP, do the following:
a.
Disconnect all telephones on the line. If this solves the problem, reconnect the telephones one at a time,
being sure to use a microfilter on each telephone. If the microfilters are connected correctly, you can connect
all your telephones.
b.
Check to see that the telephone company made the connection to your line and tested it.
c.
Verify that you are connected to the correct telephone line. If more than one phone line is installed, be sure
that you are connected to the line with the DSL service. It might be necessary to use a swapper if your DSL
signal is on pins 1 and 4 or the RJ-11 jack. The modem router uses pins 2 and 3.
2.
If you are using a cable or fiber connection to your ISP, check to see if all cable connections between the modem
router and the cable or fiber modem are good. All cables should be fully inserted in the ports.
3.
Check to see that your login credentials are correct or that the information you entered for the ISP connection
is correct.
For more information, see one of the following sections:
Troubleshooting
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Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800
Page 288 / 299
•
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
4.
Check to see if your ISP is experiencing a problem—it might not be that the modem router cannot connect to
the Internet, but rather that your ISP cannot provide an Internet connection.
Obtain an Internet IP Address
If the modem router cannot access the Internet but the DSL/Internet LED
lights solid white, see if the modem
router can obtain an Internet IP address from the ISP. Unless the modem router is assigned a static IP address, the
modem router requests an IP address from the ISP.You can determine whether the request was successful using
the modem router web pages.
To check the Internet IP address:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
3.
Enter the modem router user name and password.
The user name is
admin
.The default password is
password
.The user name and password are case-sensitive.
The BASIC Home page displays.
4.
Select
ADVANCED > ADVANCED Home
.
The ADVANCED Home page displays.
5.
In the Internet Port pane, check to see that the IP Address field shows a valid IP address.
If the field shows 0.0.0.0, your modem router did not obtain an IP address from your ISP.
If your modem router cannot obtain an IP address from the ISP, the problem might be one of the following:
•
Your Internet service provider (ISP) might require a login program. Ask your ISP whether they require PPP over
Ethernet (PPPoE) or some other type of login.
•
If you selected a login program, the service name, user name, or password could be incorrectly set. Before you
make any changes, verify that the modem router can get a PPPoE, PPPoA, PPTP, or L2TP connection (see
Verify the PPPoE, PPPoA, PPTP, or L2TP Connection
on page 289).
•
Your ISP might check for your computer’s host name. Assign the computer host name of your ISP account as
the account name. For more information, see one of the following sections:
Troubleshooting
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Page 289 / 299
•
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
•
If your ISP allows only one Ethernet MAC address to connect to Internet and checks for your computer’s MAC
address, inform your ISP that you bought a new network device and ask them to use the modem router’s MAC
address.
•
Configure your modem router to clone your computer’s MAC address. 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
Verify the PPPoE, PPPoA, PPTP, or L2TP Connection
If you use a PPPoE, PPPoA, PPTP, or L2TP connection to your ISP, make sure that the connection works.
To verify that your PPPoE, PPPoA, PPTP, or L2TP connection is working:
1.
Launch a web browser from a computer or WiFi device that is connected to the network.
2.
Enter
.
A login window opens.
3.
Enter the modem router user name and password.
The user name is
admin
.The default password is
password
.The user name and password are case-sensitive.
The BASIC Home page displays.
4.
Select
ADVANCED > ADVANCED Home
.
The ADVANCED Home page displays.
5.
In the Internet Port pane, check to see that the IP Address field shows a valid IP address and that the Connection
field shows the protocol that your connection is using (PPPoE, PPPoA, PPTP, or L2TP).
6.
In the Internet Port pane, click the
Connection Status
button.
The Connection Status page displays.
7.
Check the following:
•
The Connection Status field shows Connected.
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Page 290 / 299
•
The Connection Time field does
not
show 00:00:00.
8.
If the Connection Status field does not show Connected, try to reconnect by clicking the
Connect
button.
If the PPPoE, PPPoA, PPTP, or L2TP connection is not working, make sure that your service name, user name,
and password are set correctly. Or your ISP might not be able to provide an Internet connection. For more information,
see one of the following sections:
•
Specify an ADSL Connection With a Login and PPPoA or PPPoE Service
on page 55
•
Specify a VDSL Connection With a Login and PPPoE Service
on page 64
•
Specify a Cable or Fiber Connection With a Login and PPPoE Service
on page 72
•
Specify a Cable or Fiber Connection With a Login and PPTP or L2TP Service
on page 77
Troubleshoot Internet Browsing
If your modem router can obtain an IP address but your computer is unable to load any web pages from the Internet,
it might be for one of the following reasons:
•
The traffic meter is enabled, and the limit was reached.
By configuring the traffic meter not to block Internet access when the traffic limit is reached, you can resume
Internet access (see
Unblock the Traffic Meter After the Traffic Limit Is Reached
on page 243). If your ISP sets
a usage limit, they might charge you for the overage.
•
Your computer might not recognize any DNS server addresses.
A DNS server is a host on the Internet that translates Internet names (such as www addresses) to numeric
IP addresses. Typically your ISP provides the addresses of one or two DNS servers for your use. If you entered
a DNS address when you set up the modem router, reboot your computer and verify the DNS address.
Alternatively, you can configure your computer manually with DNS addresses, as explained in your operating
system documentation.
•
The modem router might not be configured as the TCP/IP router on your computer.
For information about TCP/IP problems, see
Troubleshoot Your Network Using the Ping Utility
on page 291.
If your computer obtains its information from the modem router by DHCP, reboot the computer and verify the
modem router address.
Changes Are Not Saved
If the modem router does not save the changes that you make in a modem router web page, do the following:
•
When entering configuration settings, always click the
Apply
button before moving to another page or tab or
your changes are lost.
•
Click the
Refresh
or
Reload
button in the web browser. It is possible that the changes occurred but that the old
settings remain in the web browser’s cache.
Troubleshooting
290
Nighthawk X4S AC2600 WiFi VDSL/ADSL Modem Router Model D7800

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