Troubleshoot AD lockout of a user account

https://www.microsoft.com/en-gb/download/details.aspx?id=15201

This application will identify on which DCs lockouts are occurring.  Find the DC and look at the security event logs for event id 4771.  General information will give the user name and source IP address/port number of the offender.

The following script may also be useful in troubleshooting

http://mikefrobbins.com/2013/11/29/powershell-script-to-determine-what-device-is-locking-out-an-active-directory-user-account/

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