Domain Admins Account.... Locked Out ever 15 minutes

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From: Johnny Azuaje (JohnnyAzuaje_at_discussions.microsoft.com)
Date: 03/21/05 

Date: Mon, 21 Mar 2005 13:59:05 -0800

Hello everybody. I have a problem. Please, let me show you my IT
infrastructure.

We have two Domain Controllers at headquarter, and two Domain Controllers,
(for the same domain), at every branch office.

I have an account that belong to the Domain Admin's group; which I use it to
start some services in my network.

Every 15 minutes (aprox.) this account has been locked out.... once and once
again.

In the security log for a Domain Controller in a branch office, I've
encountered the following record:

Event Type: Failure Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 529
Date: 3/21/2005
Time: 4:44:18 PM
User: NT AUTHORITY\SYSTEM
Computer: CETI
Description:
Logon Failure:
         Reason: Unknown user name or bad password
         User Name: myaccount
         Domain: MYDOMAIN
         Logon Type: 7
         Logon Process: Advapi
         Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
         Workstation Name: MYBRANCH_DC

1.- Do you know exactly what this message mean?
2.- How I can solve this problem, definitively?

Thanks a lot...!!!!

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