Regular Account Lockout in AD Domain

[precioustony]

One of the account in our AD domain keeps locking out and below is the error message I could find. Any clue as to what could be causing this would be appreciated.

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Event Type: Failure Audit
Event Source: Security
Event Category: Account Logon
Event ID: 680
Date: 26/10/2005
Time: 12:59:08
User: NT AUTHORITY\SYSTEM
Computer: EX-DC1
Description:
Logon attempt by:MICROSOFT_AUTHENTICATION_PACKAGE_V1_0

Logon account: user1

Source Workstation: Workstation1

Error Code: 0xC0000234

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[Smorgan11]

http://support.microsoft.com/default.aspx?scid=kb;en-us;191828

http://support.microsoft.com/default.aspx?scid=kb;en-us;264678