...
Using the Security Enhanced Directory Manager:
1. If the Allow Session Timeout (Inactivity Timeout) is unchecked, then the behavior is similar to the default Directory Manager.
2. If the Allow Session Timeout (Inactivity Timeout) is checked, then the session will time out following the session-timeout setting regardless of whether the browser window is open or nownot.
Hard Session Timeout
Hard session Timeout makes a user log out irrelevant to the activity
...