Zyxel NBG334W Router Manual PDF (Setup & Configuration Guide)

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NBG334W User’s Guide

221

C

HAPTER

25

Troubleshooting

This chapter offers some suggestions to solve problems you might encounter. The potential

problems are divided into the following categories.

•

Power, Hardware Connections, and LEDs

•

NBG334W Access and Login

•

Internet Access

•

Resetting the NBG334W to Its Factory Defaults

•

Wireless Router/AP Troubleshooting

•

Advanced Features

25.1

Power, Hardware Connections, and LEDs

V

The NBG334W does not turn on. None of the LEDs turn on.

7

Make sure you are using the power adaptor or cord included with the NBG334W.

8

Make sure the power adaptor or cord is connected to the NBG334W and plugged in to an

appropriate power source. Make sure the power source is turned on.

9

Disconnect and re-connect the power adaptor or cord to the NBG334W.

10

If the problem continues, contact the vendor.

V

One of the LEDs does not behave as expected.

1

Make sure you understand the normal behavior of the LED. See

Section 1.7 on page 33

.

2

Check the hardware connections. See the Quick Start Guide.

3

Inspect your cables for damage. Contact the vendor to replace any damaged cables.

4

Disconnect and re-connect the power adaptor to the NBG334W.

5

If the problem continues, contact the vendor.

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Chapter 25 Troubleshooting

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222

25.2

NBG334W Access and Login

V

I don’t know the IP address of my NBG334W.

1

The default IP address is

192.168.1.1

.

2

If you changed the IP address and have forgotten it, you might get the IP address of the

NBG334W by looking up the IP address of the default gateway for your computer. To do

this in most Windows computers, click

Start > Run

, enter

cmd

, and then enter

ipconfig

.

The IP address of the

Default Gateway

might be the IP address of the NBG334W (it

depends on the network), so enter this IP address in your Internet browser.Set your

device to

Router Mode

, login (see the Quick Start Guide for instructions) and go to the

Device Information

table in the

Status

screen. Your NBG334W’s IP address is

available in the

Device Information

table.

•

If the

DHCP

setting under

LAN information

is

None

, your device has a fixed IP

address.

•

If the

DHCP

setting under

LAN information

is

Client

, then your device receives an

IP address from a DHCP server on the network.

3

If your NBG334W is a DHCP client, you can find your IP address from the DHCP

server. This information is only available from the DHCP server which allocates IP

addresses on your network. Find this information directly from the DHCP server or

contact your system administrator for more information.

4

Reset your NBG334W to change all settings back to their default. This means your

current settings are lost. See

Section 25.4 on page 225

in the

Troubleshooting

for

information on resetting your NBG334W.

V

I forgot the password.

1

The default password is

1234

.

2

If this does not work, you have to reset the device to its factory defaults. See

Section

25.4 on page 225

.

V

I cannot see or access the

Login

screen in the web configurator.

1

Make sure you are using the correct IP address.

•

The default IP address is

192.168.1.1

.

•

If you changed the IP address (

Section 7.3 on page 102

), use the new IP address.

•

If you changed the IP address and have forgotten it, see the troubleshooting

suggestions for

I don’t know the IP address of my NBG334W.

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Chapter 25 Troubleshooting

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223

2

Check the hardware connections, and make sure the LEDs are behaving as expected. See

the Quick Start Guide.

3

Make sure your Internet browser does not block pop-up windows and has JavaScripts

and Java enabled. See

Appendix B on page 235

.

4

Make sure your computer is in the same subnet as the NBG334W. (If you know that

there are routers between your computer and the NBG334W, skip this step.)

•

If there is a DHCP server on your network, make sure your computer is using a

dynamic IP address. See

Section 7.3 on page 102

.

•

If there is no DHCP server on your network, make sure your computer’s IP address is

in the same subnet as the NBG334W. See

Section 7.3 on page 102

.

5

Reset the device to its factory defaults, and try to access the NBG334W with the default

IP address. See

Section 7.3 on page 102

.

6

If the problem continues, contact the network administrator or vendor, or try one of the

advanced suggestions.

Advanced Suggestions

•

Try to access the NBG334W using another service, such as Telnet. If you can access the

NBG334W, check the remote management settings and firewall rules to find out why the

NBG334W does not respond to HTTP.

•

If your computer is connected to the

WAN

port or is connected wirelessly, use a computer

that is connected to a

LAN

/

ETHERNET

port.

V

I can see the

Login

screen, but I cannot log in to the NBG334W.

1

Make sure you have entered the password correctly. The default password is

1234

. This

field is case-sensitive, so make sure [Caps Lock] is not on.

2

You cannot log in to the web configurator while someone is using Telnet to access the

NBG334W. Log out of the NBG334W in the other session, or ask the person who is

logged in to log out.

3

Disconnect and re-connect the power adaptor or cord to the NBG334W.

4

If this does not work, you have to reset the device to its factory defaults. See

Section

25.4 on page 225

.

V

I cannot Telnet to the NBG334W.

See the troubleshooting suggestions for

I cannot see or access the Login screen in the web

configurator.

Ignore the suggestions about your browser.

V

I cannot use FTP to upload / download the configuration file. / I cannot use

FTP to upload new firmware.

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Chapter 25 Troubleshooting

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224

See the troubleshooting suggestions for

I cannot see or access the Login screen in the web

configurator.

Ignore the suggestions about your browser.

25.3

Internet Access

V

I cannot access the Internet.

1

Check the hardware connections, and make sure the LEDs are behaving as expected. See

the Quick Start Guide.

2

Make sure you entered your ISP account information correctly in the wizard. These

fields are case-sensitive, so make sure [Caps Lock] is not on.

3

If you are trying to access the Internet wirelessly, make sure the wireless settings in the

wireless client are the same as the settings in the AP.

4

Disconnect all the cables from your device, and follow the directions in the Quick Start

Guide again.

5

Go to Maintenance > Sys OP Mode > General. Check your System Operation Mode

setting.

• Select

Router

if your device routes traffic between a local network and another

network such as the Internet.

• Select

Access Point

if your device bridges traffic between clients on the same

network.

6

If the problem continues, contact your ISP.

V

I cannot access the Internet anymore. I had access to the Internet (with the

NBG334W), but my Internet connection is not available anymore.

1

Check the hardware connections, and make sure the LEDs are behaving as expected. See

the Quick Start Guide and

Section 1.7 on page 33

.

2

Reboot the NBG334W.

3

If the problem continues, contact your ISP.

V

The Internet connection is slow or intermittent.

1

There might be a lot of traffic on the network. Look at the LEDs, and check

Section 1.7

on page 33

. If the NBG334W is sending or receiving a lot of information, try closing

some programs that use the Internet, especially peer-to-peer applications.

2

Check the signal strength. If the signal strength is low, try moving the NBG334W closer

to the AP if possible, and look around to see if there are any devices that might be

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Chapter 25 Troubleshooting

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225

interfering with the wireless network (for example, microwaves, other wireless

networks, and so on).

3

Reboot the NBG334W.

4

If the problem continues, contact the network administrator or vendor, or try one of the

advanced suggestions.

Advanced Suggestions

•

Check the settings for bandwidth management. If it is disabled, you might consider

activating it. If it is enabled, you might consider changing the allocations.

•

Check the settings for QoS. If it is disabled, you might consider activating it. If it is

enabled, you might consider raising or lowering the priority for some applications.

25.4

Resetting the NBG334W to Its Factory Defaults

If you reset the NBG334W, you lose all of the changes you have made. The NBG334W re-

loads its default settings, and the password resets to

1234

. You have to make all of your

changes again.

V

You will lose all of your changes when you push the

RESET

button.

To reset the NBG334W,

1

Make sure the power

LED

is on and not blinking.

2

P

ress and hold the

RESET

button for five to ten seconds. Release the

RESET

button

when the power

LED begins to blink. The default settings have been restored.

If the NBG334W restarts automatically, wait for the NBG334W to finish restarting, and log in

to the web configurator. The password is “1234”.

If the NBG334W does not restart automatically,

di

sconnect and reconnect the NBG334W’s

power. Then, follow the directions above again.

25.5

Wireless Router/AP Troubleshooting

V

I cannot access the NBG334W or ping any computer from the WLAN (wireless

AP or router).

1

Make sure the wireless LAN is enabled on the NBG334W

2

Make sure the wireless adapter on the wireless station is working properly.

3

Make sure the wireless adapter installed on your computer is IEEE 802.11 compatible

and supports the same wireless standard as the NBG334W.

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