Active Directory account lockouts happen when too many failed login attempts trigger security limits. Common causes include outdated cached credentials, expired service account passwords, mobile devices syncing with old credentials, stale mapped drives, user mistakes, and misconfigured policies. Reviewing logs and authentication sources helps identify and fix the issue. If your accounts are frequently getting locked out in Active Directory, follow the solutions mentioned below.
- Enable Account Lockout Audit Policy in Active Directory
- Identify the Lockout Source Using the PDC Emulator and Event Viewer
- Trace Failed Pre-Authentication Attempts
- Audit and Update Stored Credentials on the Source Machine