Finding the source for locked AD account from Event Viewer log on Domain controller

Posted on 16.01.18   Active Directory Microsoft Security SysAdmin

It’s actually really simple, but you’ll need administrator access on the domain controller in order to read the security event log so you might have to consult upper sys admins.

It seems to not want to filter/sort by username though so if you’re managing a huge enterprise with thousands of users this could be a bit tedious. On the other side, if that’s the case I suppose you already have better tools for the job.

Anyway, all invalid login attempts are logged as event id 4776 (Credential Validation).

  1. Open Event Viewer and connect to domain controller
  2. Go to Windows Logs -> Security
  3. Click on Filter Current Log... in the right navigation menu
  4. Enter 4776 into the input field which says <All Event IDs>
  5. Browse through the invalid login attempts till you find the one which belongs to your user and look in the description text field where it says “Source Workstation:    hostname”

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