AD account for user keeps locking out

itadminhelp used Ask the Experts™
AD account keeps locking out few times a day.
We don't know which device is causing log outlook.

I have cleared out saved password from server browsers and credential Manager in local machine.

Is there a way to find out which device is causing lock out?
And free apps or power shell command?
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Gaurav SinghSolutions Architect
check the event ID 4740 on Domain controller. you will be able to find out the device from there.
Satish AutiSenior System Administrator
use account lockout status utility to identify on which server it's getting locked.
As you cleared all stored password , see if there is any map drive configure to use old credentials also check if any mobile device  is configured with old passwords.
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Tech Lead
There may be many causes for account locked out, like:

user's account in stored user name and passwords
user's account tied to persistent mapped drive
user's account as a service account
user's account used as an IIS application pool identity
user's account tied to a scheduled task
un-suspending a virtual machine after a user's pw as changed

For more refer KB article:

What are the common root causes of account lockouts and do I resolve them:

Identify the source of Account Lockouts in Active Directory:

Troubleshooting account lockout the Microsoft PSS way:

Hope this helps!
Shaun VermaakTechnical Specialist
Awarded 2017
Distinguished Expert 2018
E ATech Lead

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