AD Account lockout

I have a user that is getting repeatedly locked out of his Active Directory account. I have checked his mobile phone and removed and re-added the exchange account with the correct credentials. I have run rundll32.exe keymgr.dll, KRShowKeyMgr -- and removed all cached credentials. I have deleted the cached passwords from Internet Explorer. I have checked for any mapped drives and I have removed and re-added the Outlook profile.

I h ave also downloaded and ran the lockoutexaminer. This shows the orig. lock as one of our domain controllers.

I have checked the security event log on the DC for event 4740 and it shows the lockout and the caller computer name is our Exchange server.

The lockouts started happening after the last password change. I also tried changing the password back to the original password,but that did not help either

The lockout appears to occur at regular 15 minute intervals.

Is there anything else I can check to find the source of the account lockout?

Thanks

ExchangeActive DirectoryWindows Server 2008

Last Comment

Donna H

8/22/2022 - Mon

Shaun Vermaak

3/29/2017

Have a look at my article
https://www.experts-exchange.com/articles/29305/Active-Directory-Locked-Account-Investigation-Process.html

Jeff Glover

3/29/2017

Perhaps searching the IIS logs on your Exchange server will point you in the right direction.Perhaps he has an iPad or some other thing configured and forgot. I would search the logs for his logon name and see what is trying to use ActiveSync.

Donna H

3/29/2017

ASKER

Thanks Shaun.

I ran the event comb but I didnt get any results. I am checking the rest of the solutions in your article.

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Donna H

3/29/2017

ASKER

Thanks Jeff,

I will try checking the IIS logs on the Exchange server.

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