AD Account blocked

I have a user who keeps getting blocked out of his AD account. Last time this happened we found an old phone trying to connect to the system using an old username and password, and after a few attempts it would block the account and then the user couldn't log into his laptop.

Is there any way I can find out what is trying to access with the incorrect password and causing the account blocking.
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It should all be logged in the security event log.
If it's another phone, just check the IIS log of the OWA (have his current working phone off, just so it's easier to browse through the log)..
Will SzymkowskiSenior Solution ArchitectCommented:
Active Directory Auditing is not enabled by default so if it is not enabled you will not see these events in the security log. I have created a HowTo for setting up and confiiguring active directory auditing. See the link below...


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Windows Server 2012

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