By default, the module is configured with "Strict mode NO" (back-end). This allows users to have multiple log-ins from the same work station. Set the module to "Strict mode YES" and test as follows:
- Log into the front-end.
- Completely close your browser without logging off.
- Re-open browser and log-in again.
You should now see the Only Once! notification.

Today i downloaded and installed both the plugins, and i desabled joomla plugins.

But for some reason i am still able to login to site mulitple times using single username.
Please help