Issue:
An active directory user account is constantly locked out. When you unlock it, 3 seconds later it's locked again.
Solution:
In our case the user requested a password reset, but the user did not say/know/remember that he was logged in on another (monitoring)system at the time. This has happened in the past, without any problem, but in this case the problem was that the system that was logged on with the old password, was making the account getting locked, because it was authenticating with the old password after the password reset.
Simply ask the user to log out on all systems. Reset the password and the user can work again.
