The On-line users module can be enabled in Site Manager -> Settings -> Security & Membership by checking the Monitor on-line users check-box.

 

If you are running the system on a web farm, you also have to check the Store on-line users in database check-box. This causes information about on-line users to be saved in the database.

 

The Deny login interval property determines how long users will not be able to log-in after they are kicked. The value is entered in minutes.

 

Finally, the Update on-line users (minutes) property defines how often information about users accessing the site is reloaded. The value is entered in minutes. When running the system on a web farm, you need to enter the same value which is set for the Remove expired sessions scheduled task (you can read the value in Site Manager -> Administration -> Scheduled tasks -> edit () Remove expired sessions -> Task interval -> Every: X minute).