Zyxel P-661HNU-F1 Router Manual PDF (Setup & Configuration Guide)

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Chapter 26 Troubleshooting

P-661HNU-Fx User’s Guide

266

One of the LEDs does not behave as expected.

1

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

Section 1.6 on

page 26

.

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

Turn the ZyXEL Device off and on.

5

If the problem continues, contact the vendor.

26.3

ZyXEL Device Access and Login

I forgot the IP address for the ZyXEL Device.

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 ZyXEL Device 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 ZyXEL Device (it depends on the network), so enter this IP address

in your Internet browser.

3

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

Section 1.7 on page 27

.

I forgot the password.

1

The default admin and user password is

1234

.

2

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

Section 1.7 on page 27

.

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Chapter 26 Troubleshooting

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267

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 - see

page 155

, use the new IP address.

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

suggestions for

I forgot the IP address for the ZyXEL Device.

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 C on page 325

.

4

Reset the device to its factory defaults, and try to access the ZyXEL Device with

the default IP address. See

Section 1.7 on page 27

.

5

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

of the advanced suggestions.

Advanced Suggestions

•

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

access the ZyXEL Device, check the remote management settings and firewall

rules to find out why the ZyXEL Device 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 an

ETHERNET

port.

I can see the

Login

screen, but I cannot log in to the ZyXEL Device.

1

Make sure you have entered the user name and password correctly. The default

user name is

admin

. These fields are 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 ZyXEL Device. Log out of the ZyXEL Device in the other session, or ask the

person who is logged in to log out.

3

Turn the ZyXEL Device off, wait for one minute and turn it back on.

4

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

Section 26.2 on page 265

.

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Chapter 26 Troubleshooting

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268

I cannot telnet to the ZyXEL Device.

See the troubleshooting suggestions for

I cannot see or access the Login screen in

the web configurator.

Ignore the suggestions about your browser.

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

upload new firmware.

See the troubleshooting suggestions for

I cannot see or access the Login screen in

the web configurator.

Ignore the suggestions about your browser.

26.4

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 and

Section 1.6 on page 26

.

2

Make sure you entered your ISP account information correctly. 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

If you are trying to access the Internet wirelessly, make sure you have enabled

the wireless LAN by the

WPS/WLAN

button or the

Network Setting >

Wireless

> General

screen.

5

Turn the ZyXEL Device off. Disconnect all the cables from your device, and follow

the directions in the Quick Start Guide again.

6

If the problem continues, contact your ISP.

I cannot access the Internet through a DSL connection.

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Chapter 26 Troubleshooting

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269

1

Make sure you configured a proper DSL WAN connection with the Internet account

information provided by your ISP.

2

If you set up a WAN connection using bridging service (all LAN ports and WLAN

BSSs are bridged to one WAN connection), make sure you turn off the DHCP

feature in the

Home Networking

screen to have the clients get WAN IP

addresses directly from your ISP’s DHCP server.

I cannot create multiple connections of the same type.

Your WAN interface must enable VLAN and fill each WAN connection with different

VLAN IDs.

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

Device), 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 1.6 on page 26

.

2

Turn the ZyXEL Device off, wait for one minute and turn it back on.

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

1.6 on page 26

. If the ZyXEL Device is sending or receiving a lot of information,

try closing some programs that use the Internet, especially peer-to-peer

applications.

2

Turn the ZyXEL Device off, wait for one minute and turn it back on.

3

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

of the advanced suggestions.

Advanced Suggestions

•

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.

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Chapter 26 Troubleshooting

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270

26.5

Wireless Internet Access

What factors may cause intermittent or unstabled wireless connection? How can I

solve this problem?

The following factors may cause interference:

•

Obstacles: walls, ceilings, furniture, and so on.

•

Building Materials: metal doors, aluminum studs.

•

Electrical devices: microwaves, monitors, electric motors, cordless phones, and

other wireless devices.

To optimize the speed and quality of your wireless connection, you can:

•

Move your wireless device closer to the AP if the signal strength is low.

•

Reduce wireless interference that may be caused by other wireless networks or

surrounding wireless electronics such as cordless phones.

•

Place the AP where there are minimum obstacles (such as walls and ceilings)

between the AP and the wireless client.

•

Reduce the number of wireless clients connecting to the same AP

simultaneously, or add additional APs if necessary.

•

Try closing some programs that use the Internet, especially peer-to-peer

applications. If the wireless client is sending or receiving a lot of information, it

may have too many programs open that use the Internet.

•

Position the antennas for best reception. If the AP is placed on a table or floor,

point the antennas upwards. If the AP is placed at a high position, point the

antennas downwards. Try pointing the antennas in different directions and

check which provides the strongest signal to the wireless clients.

What wireless security modes does my ZyXEL Device support?

Wireless security is vital to your network. It protects communications between

wireless stations, access points and the wired network.

The available security modes in your ZyXEL device are as follows:

•

WPA2-PSK:

(recommended) This uses a pre-shared key with the WPA2

standard.

•

WPA-PSK:

This has the device use either WPA-PSK or WPA2-PSK depending on

which security mode the wireless client uses.

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