Log in as the machine administrator from Web Image Monitor.
Point to [Device Management], and then click [Configuration].
Click [User Lockout Policy] under "Security".
Set "Lockout" to [Active].
In the drop-down menu, select the number of login attempts to permit before applying lockout.
After lockout, if you want to cancel lockout after a specified time elapses, set "Lockout Release Timer" to [Active].
In the "Lock Out User for" field, enter the number of minutes until lockout is disabled.
Click [OK].
User Lockout Policy is set.
Log out.