Unable to set Password in /var/lib/openhab2/etc/users.properties

I run openhab 2.3.0 in raspberry pi 3.
Everything works pretty fine, but performing some test outside my network, I do not have a password. Checking up the docs in openhab I have to edit the user.properties, I used the terminal to change the password, I used nano to edit the file, I have read some post, but for me nothing works.

When I type my adress outside of my network, it does not request a password, so I can manage the setup.

I am missing something.

Thank you in advance