> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/analytics-alerts/alerts-by-name/failed-login-for-locked-out-account.md).

# Failed Login For Locked-Out Account

### Synopsis

| Field                | Value                                                                                                       |
| -------------------- | ----------------------------------------------------------------------------------------------------------- |
| Activation Period    | 14 Days                                                                                                     |
| Training Period      | 30 Days                                                                                                     |
| Test Period          | N/A (single event)                                                                                          |
| Deduplication Period | 1 Day                                                                                                       |
| Required Data        | <p>Requires one of the following data sources:<br>Palo Alto Networks Firewall traffic Logs OR XDR Agent</p> |
| ATT\&CK Tactic       | Defense Evasion (TA0005)                                                                                    |
| ATT\&CK Technique    | Valid Accounts (T1078)                                                                                      |
| Severity             | Informational                                                                                               |

### Description

A locked-out user account (event ID 4725 or 4740) was used in a Kerberos TGT pre-authentication attempt.

### Attacker's Goals

Authenticate using the principal in the TGT, not knowing that it has been revoked.

### Investigative actions

* Check whether you have issues with your Cloud Identity Engine failing to sync data from Active Directory.
* Check whether the attempt to use the principals (user accounts) specified in the alert are legitimate. For example, a user or a script that was not updated that the account has been revoked.
* The lockout can be temporary, for example, in the case of too many login attempts, and may not be visible after the account was released.
* Search for Windows Event Log 4740 to ascertain whether the account was locked out during the time of the alert.


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