AD account for user keeps locking out

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 SinghHead - Managed ServicesCommented:
check the event ID 4740 on Domain controller. you will be able to find out the device from there.
Satish AutiSenior System AdministratorCommented:
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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Ajit SinghCommented:
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!

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Shaun VermaakTechnical SpecialistCommented:
Ajit SinghCommented:
No further question from author. Please post back if you have.
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