Monitoring logged in users.

There are several plugins within Nagios exchange websites which checks for user login.

Vis these plugins a specific user or group of user’s login can be checked.

This check can be enabled as an active check or passive depending upon the nature of the service.

Some of such types of plugins are - get_users.ps1, check_user etc.

Benefits-

1. Prevention of unexpected user’s login.
   
2. Prevention if unauthorized access to any server.