This feature is available with ProductCart v4.1 and up after installing Security Patch 20161213.
The feature will automatically lock any control panel accounts when suspicious activity is detected. We strongly recommend activating this feature for the best security.
Disclaimer: If you are a "power-user" that has manually modified your store's database to add extra master user accounts, then this feature will lock those extra accounts. If you have more than one master account we recommend reducing permissions before you enable this feature. To reduce a master user to a normal admin user, simply locate the user and re-save their profile. The permissions that you manually added to the database will be overwritten with normal access permissions.
To enable this feature navigate to "Settings > Advanced Settings > Advanced Security Settings" and check the box next to "Lock Suspicious User Accounts".