Please follow the below template, it will help us to help you!
Should display admin webpage when I enter 192.168.0.40/admin
Unable to connect
Firefox can’t establish a connection to the server at 192.168.0.40.
The site could be temporarily unavailable or too busy. Try again in a few moments. If you are unable to load any pages, check your computer’s network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.