The System Manager can be used to see what users are currently connected to the project. This can be accessed on the Security Tab.
From the security system, Sinolta can be set up for Intrusion detection. You can set up the system to generate an alarm when a login attempt is made too frequently over a specified period of time (example, 3 or more failed attempts in 1 minute).
The system can generate an alarm for the operators to see and you can also set up logic to send an email when this situation occurs.