Access UI locally

I can use Volumio2 successfully from an external computer, by using it ip address:
Unfortunately, when I am trying to connect to the UI locally (using my preffered web browser), it does not find the home page.
Trying with “localhost” or “volumio” does not help.
But it starts loading when I type “localhost:3000”. Unfortunately, it never completes loading: the nice circles continues to turn.
Any idea?

My aim is to display Volumio2 UI on a local touch screen.