Chapter 34 Troubleshooting
VSG1435-B101 Series User’s Guide
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• If you changed the IP address (Section 8.2 on page 134), 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 Section 1.6 on page 29.
3 Make sure your Internet browser does not block pop-up windows and has
JavaScripts and Java enabled. See Appendix C on page 359.
4 If it is possible to log in from another interface, check the service control settings
for HTTP and HTTPS (Security Settings > Service Control).
5 Reset the device to its factory defaults, and try to access the ZyXEL Device with
the default IP address. See Section 1.8 on page 32.
6 If the problem continues, contact the network administrator or vendor, or try one
of the advanced suggestions.
Advanced Suggestions
• Make sure you have logged out of any earlier management sessions using the
same user account even if they were through a different interface or using a
different browser.
• 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 password correctly. The default admin password
is 1234. The 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 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 and on.
4 If this does not work, you have to reset the device to its factory defaults. See
Section 34.1 on page 311.
