Zyxel NBG5615 Router Manual PDF (Setup & Configuration Guide)

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NBG5715 User’s Guide

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NBG5715 User’s Guide

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C

HAPTER

23

Troubleshooting

23.1

Overview

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

•

NBG5715 Access and Login

•

Internet Access

•

Resetting the NBG5715 to Its Factory Defaults

•

Wireless Router Troubleshooting

•

USB Device Problems

•

ZyXEL NetUSB Share Center Utility Problems

23.2

Power, Hardware Connections, and LEDs

The NBG5715 does not turn on. None of the LEDs turn on.

1

Make sure you are using the power adaptor or cord included with the NBG5715.

2

Make sure the power adaptor or cord is connected to the NBG5715 and plugged in to an appropriate

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

3

Disconnect and re-connect the power adaptor or cord to the NBG5715.

4

Make sure the

LED

button on the side panel of the NBG5715 is at the

ON

position. If the

LED

button is turned off, the

Power

LED should be still on for you to determin if the NBG5715 is

receiving power.

5

If the problem continues, contact the vendor.

One of the LEDs does not behave as expected.

1

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

Section 1.5 on page 17

.

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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 NBG5715.

5

If the problem continues, contact the vendor.

23.3

NBG5715 Access and Login

I don’t know the IP address of my NBG5715.

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 NBG5715

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 NBG5715 (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 NBG5715’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 NBG5715 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 NBG5715 to change all settings back to their default. This means your current settings

are lost. See

Section 23.5 on page 171

in the

Troubleshooting

for information on resetting your

NBG5715.

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 23.5 on page

171

.

I cannot see or access the

Login

screen in the Web Configurator.

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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 12.4 on page 92

), 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 NBG5715.

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 JavaScript and Java

enabled. See

Appendix A on page 175

.

4

Make sure your computer is in the same subnet as the NBG5715. (If you know that there are

routers between your computer and the NBG5715, skip this step.)

•

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

address. See

Section 13.2 on page 95

.

•

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

same subnet as the NBG5715. See

Appendix B on page 186

.

5

Reset the device to its factory defaults, and try to access the NBG5715 with the default IP address.

See

Chapter 22 on page 163

.

6

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

suggestions.

Advanced Suggestions

•

Try to access the NBG5715 using another service, such as Telnet. If you can access the

NBG5715, check the remote management settings and firewall rules to find out why the

NBG5715 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.

I can see the

Login

screen, but I cannot log in to the NBG5715.

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 NBG5715.

Log out of the NBG5715 in the other session, or ask the person who is logged in to log out.

3

This can happen when you fail to log out properly from your last session. Try logging in again after

5 minutes.

4

Disconnect and re-connect the power adaptor or cord to the NBG5715.

5

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

Section 23.5 on page

171

.

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23.4

Internet Access

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 WAN screen. 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

If the problem continues, contact your ISP.

I cannot access the Internet anymore. I had access to the Internet (with the NBG5715), 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 1.5 on page 17

.

2

Reboot the NBG5715.

3

If the problem continues, contact your ISP.

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 1.5 on page 17

.

If the NBG5715 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 NBG5715 closer to the AP if

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

network (for example, microwaves, other wireless networks, and so on).

3

Reboot the NBG5715.

4

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

suggestions.

Advanced Suggestion

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