For security purposes a user's account will be locked if their password has been entered incorrectly more than five times. If this happens the user receives a message on screen saying "User account is locked due to too many failed login attempts. Please use the "Forgotten Password" link below to reset your password and unlock account". Using the Forgotten Password feature the user will be sent a temporary password by email and will be able to log in with that.
Searching for Locked Users
It is possible to search for locked users by going to the Administration module > Administration > Users, selecting More Options to the right of the search filters, changing the State filter to Locked and clicking Search.
Community Administrators and User Administrators can also unlock a user's account by editing the user, selecting Unlock and then Save.