Hello, friend!
Since I don't know your device model, I can only use the ONT as an example:
1. Use a network cable to connect the LAN port of the device to a PC.
2. Ensure that the Internet Explorer (IE) of the PC does not use the proxy server. The following section considers IE 8.0 as an example to describe how to check whether the IE uses the proxy server.
In the Proxy server area, ensure that the Use a proxy server for your LAN (These settings will not apply to dial-up or VPN connections). a check box is not selected (that is, without the "√" sign). If the check box is selected, deselect it, and then click OK.
3. Set the IP address and subnet mask of the PC. For details. Please see:
LAN IP address and subnet mask
Default settings:
IP address: 192.168.0.1
Subnet mask: 255.255.255.0
IP address and subnet mask of the PC
Configure the IP address of the PC to be in the same subnet as the LAN IP address of the device.
For example:
IP address: 192.168.0.100
Subnet mask: 255.255.255.0
4. Log in to the Web configuration interface.
Enter http://192.168.0.1 in the address bar of IE, and then press Enter to display the login interface.
Note: The web page login supports SSL3.0, TLS1.0, TLS1.1, and TLS1.2. It is recommended that you use high-security TLS1.1 or TLS1.2 if you log in to the device using https. The TCP port 80 is used for listening for HTTPS packets. You need to type "https://192.168.0.1:80" in the address bar of IE and press Enter to log in to the device.
Thanks!