`mdbook serve` does not create server apparently (Windows 11)

[dxrcy]

I have ran mdbook init to create the template book, and then mdbook serve --open to listen, and the browser just shows Unable to connect Firefox can’t establish a connection to the server at localhost:3000

I have tried on multiple browsers, and ping command, and hosting on different terminals.

Terminal output just shows normal success messages for Book building has started, Running the html backend, ect.

I am on Windows 11.