ZyXEL Communications 5 Series User Manual

 Chapter 54 Troubleshooting

ZyWALL 5/35/70 Series User’s Guide

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

dynamic IP address. See 

. Your ZyWALL is a DHCP server 

by default. 

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

IP address. See 

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

advanced suggestions.

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

ZyWALL, check the remote management settings, firewall rules, and SMT filters to find 
out why the ZyWALL 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 port.

• You may also need to clear your Internet browser’s cache.

In Internet Explorer, click Tools and then Internet Options to open the Internet Options 
screen. 

In the General tab, click Delete Files. In the pop-up window, select the Delete all offline 
content check box and click OK. Click OK in the Internet Options screen to close it.

• If you disconnect your computer from one device and connect it to another device that has 

the same IP address, your computer’s ARP (Address Resolution Protocol) table may 
contain an entry that maps the management IP address to the previous device’s MAC 
address). 

In Windows, use arp -d at the command prompt to delete all entries in your computer’s 
ARP table.

V

I can see the Login screen, but I cannot log in to the ZyWALL.

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

name is admin, and the default password is 1234. 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 the SMT, Telnet, or 

the console port to access the ZyWALL. Log out of the ZyWALL in the other session, or 
ask the person who is logged in to log out.

3 Turn the ZyWALL off and on or disconnect and re-connect the power adaptor or cord to 

the ZyWALL. 

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

.

V

I cannot access the SMT. / I cannot Telnet to the ZyWALL.