ZyXEL Communications P-661HNU-Fx User Manual

 Chapter 26 Troubleshooting

ADSL Series User’s Guide

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

. 

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

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.

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. 

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

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

.

I cannot telnet to the ZyXEL Device. 

See the troubleshooting suggestions for 

 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 

 Ignore the suggestions about your browser.