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Chapter 26 Troubleshooting
NBG4115 User’s Guide
187
If you changed the IP address and have forgotten it, see the troubleshooting suggestions for I
don’t know the IP address of my NBG4115.
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 JavaScripts and Java
enabled. See Appendix A on page 193.
4 Make sure your computer is in the same subnet as the NBG4115. (If you know that there are
routers between your computer and the NBG4115, skip this step.)
If there is a DHCP server on your network, make sure your computer is using a dynamic IP
address. See Appendix C on page 215.
If there is no DHCP server on your network, make sure your computer’s IP address is in the
same subnet as the NBG4115. See Appendix C on page 215.
5 Reset the device to its factory defaults, and try to access the NBG4115 with the default IP address.
See Section 9.3 on page 114.
6 If the problem continues, contact the network administrator or vendor, or try one of the advanced
suggestions.
Advanced Suggestions
Try to access the NBG4115 using another service, such as Telnet. If you can access the
NBG4115, check the remote management settings and firewall rules to find out why the
NBG4115 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/ETHERNET port.
I can see the Login screen, but I cannot log in to the NBG4115.
1 Make sure you have entered the password correctly. The default password is 1234. This 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 NBG4115.
Log out of the NBG4115 in the other session, or ask the person who is logged in to log out.
3 This can happen when you fail to log out properly from your last session. Try logging in again after
5 minutes.
4 Disconnect and re-connect the power adaptor or cord to the NBG4115.
5 If this does not work, you have to reset the device to its factory defaults. See Section 26.5 on page
189.
187


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