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account lockout

I have recently found a user that is being locked out-what seems about every hour.  i used the eventcombs and accountlockout status to determine where and what.
today I found on one of my 2003 servers this user was locked out with a 644 code after getting three of these;
events 675 three times.
Pre-authentication failed:
       User Name:      user1
       User ID:            domain\user1
       Service Name:      krbtgt/domain
       Pre-Authentication Type:      0x2
       Failure Code:      0x18
       Client Address:

I have been reading alot of entries about services and scheduled tasks - which there are none at this point for this user.  in addition- I am confused by the "client address" this is comming from.

looking at the event log closed- authentication for this user is being initiated by "stystem".

not sure where to go for this now....suggestions comments.
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1 Solution
NikSystems SpecialistCommented:
You can use alockout.dll along with the locoutstatus.exe tool on the user's workstation, which should help  with figuring out what's going on with this specific account.


dtooth71Author Commented:
I used the tools to get to the point I am now- the client address is and this is coming from a server machine that I can not install these tools....
dtooth71Author Commented:
does anyone have an idea about the lockout comming from lookback address?
dtooth71Author Commented:
i found the service that was locking the ccount out.
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