Domain Controler error Windows 2003 Server Event ID: 531 - Account Disabled

Each night around the same time we see this event on one of our Domain Controllers:
Log=Security
Time=11/1/2008 2:07:09 AM
ID=531
Type=Failure Audit
Cat=Logon/Logoff
Src=Security
Comp=GENESIS
Acct=SYSTEM
Msg=Logon Failure:

        Reason:         Account currently disabled
        User Name:
        Domain:
        Logon Type:     3
        Logon Process:  Authz
        Authentication Package: Kerberos
        Workstation Name:     GENESIS
        Caller User Name:       GENESIS$
        Caller Domain:  NIAID
        Caller Logon ID:        (0x0,0x3E7)
        Caller Process ID:      1044
        Transited Services:     -
        Source Network Address: -
        Source Port:    -

Genesis is the name of our Domain Controller.  I saw some other postings about this saying that it had to do with the "Licensing Server".  Can someone shed some light for me on what a "Licensing Server" is.  I did check the Licensing server settings in Site and Services and it says "Invalid".  Any help would be appreciated.

Thanks!

esbfernAsked:
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meugenCommented:
Try to disable Licensing Server service and then check the Eventviewer again.
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esbfernAuthor Commented:
Was unable to figure out what the true cause.  There is no harm in these errors, they jsut generate noise.  Closing post.  
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