I recently installed geoserver under macos. When I typed http://localhost:8080/geoserver/web/ in the navigator, I'm asked to inquire a login and a pwd. I remember giving the user_name of my machine while the process of the installation. Yet I don't remember setting any password. I don't know from where I can't get the password, assuming that the username fits the one I set the first time?
From the docs:
The default administration credentials are:
User name: admin