It is about "Remember me" function which is present as a checkbox at the login page.

Unchecked - user is logged out after page refresh (e.g. press F5) or page closure (it is enough to close one of multiple opened tabs to be logged out in all of those tabs)
Checked - user isn't logged out after page refresh, tab or window closure.

It is confusing for users they need to check Remember me when logging in in order to prevent to be logged out when any tab is closed.

Suggestion:
1. Develop classic "Remember me" function used only for users not to be forced to input their credentials every time they work with Hawtio if it is not big security risk.

2. Prevent Hawtio from logging out user after single tab closure.