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66  NTU Optical Network Terminals 
APPENDIX A. POSSIBLE PROBLEMS AND THEIR SOLUTIONS 
Web interface is not 
available when the router 
IP address entered (e. g. 
192.168.1.1) 
The computer is not in the 
same IP subnetwork for 
connection to the web 
interface. 
Select the Obtain an IP address automatically 
checkbox in the Internet connection settings on your 
PC. 
 
 
Javascript is disabled in the 
web browser installed on the 
PC. 
Enable Javascript in the web browser or use another 
web browser. 
Check the physical connection by checking status 
LEDs (all LEDs should be on). If the LEDs are off, use 
another cable or connect to another port of the 
device if available. If your computer is switched off, 
LEDs may also be off. 
Access is denied by some 
Internet security software 
installed on your PC. 
Disable the Internet security software (firewalls) 
installed on your PC. 
Error signal in the phone 
connected to the FXS port 
Invalid port configuration 
Check settings in the VoIP menu (see section 4.3.2 
SIP Advanced Settings submenu). 
 
The password to web 
interface of the device is 
lost or does not work. 
Reset the router to default settings using the F 
button on the rear panel. Unfortunately, all changes 
you made in the settings will be lost in this case.