ZyXEL Communications P-660RU-Tx User Manual

 Chapter 25 Troubleshooting

P-660RU-Tx User’s Guide

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

suggestions for 

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

Make sure your Internet browser does not block pop-up windows and has 
JavaScripts and Java enabled. See 

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

. Your P-660RU-Tx is a DHCP 

server by default.

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

address is in the same subnet as the P-660RU-Tx. See 

Reset the device to its factory defaults, and try to access the P-660RU-Tx 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 P-660RU-Tx using another service, such as Telnet. If you can 

access the P-660RU-Tx, check the remote management settings and firewall 

rules to find out why the P-660RU-Tx does not respond to HTTP. 

• If your computer is connected to the WAN port, use a computer that is 

connected to a ETHERNET port.

I can see the Login screen, but I cannot log in to the P-660RU-Tx.

Make sure you have entered the password correctly. The default password is 
1234. The field is 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 P-660RU-Tx. Log out of the P-660RU-Tx in the other session, or ask the person 
who is logged in to log out. 

Turn the P-660RU-Tx off and on. 

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

.