1. Programs with cached credentials
2. Changed password in a service account
3. Having a bad password limit that’s too low
4. Users accessing AD with multiple devices
5. Forgetting to update stored passwords
6. Scheduled tasks with out-of-date credentials
7. Drive mappings with out-of-date credentials
8. Improper Active Directory replication
9. Disconnected terminal server sessions
10. Out-of-date service logon passwords
10 Common Reasons for a Windows AD Lockout
