When you add a domain, specify whether to enable account locking. When the Enable Account Locking option is selected, user accounts are locked after a specified number of consecutive authentication failures. After a specified length of time, the user can attempt to authenticate again. This feature prevents users from trying various credential combinations to access the system.
Use settings on the Domain Management page to specify the maximum number of authentication failures and the length of time that accounts are locked. These settings apply to all domains that have account locking enabled.