Security Failure Audit Account Logon Event ID 675

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Subject: Security Failure Audit Account Logon Event ID 675
Posted by:  Kashif (Kash…@discussions.microsoft.com)
Date: Sun, 31 May 2009

I'm sorry for posting this here, I couldn't locate the proper group to post it.
My Primary Domain controller is Filling this Failure Audit EVENT" every few
minutes.
Source: Security
Event ID 675
NT AUTHORITY\SYSTEM
Computer DC!
Pre-authentication Failed:
User Name: Administrator
User ID: MyDomain\administrator
Service Name krbtgt/Mydomain
Pre-authentication type: 0x2
Failure code: 0x18
Client address 127.0.0.1

I checked for krbtgt Built in account and found it disable.
I tried to enable this account but Windows gave me error.
"Windows cannot enable object krbtgt because:
cannot perform this operation on built-in accounts.

Please help .....

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