Set up asterisknow in isolated network

I need to install asterisknow in isolated network.
I can install it nicely, and also success with login and password.

Unfortunately, when I want to do this step:
"Go to another computer on the same network and enter that IP address into your web browser. The first time you do so you’ll be asked to create the admin username and the admin password"
On that computer, its appear "This page cannot be displayed, Please check your network connection.

What should I do? Please help me on this. I really need to set up asterisknow in isolated network.