LOGON Failures

Posted on 2009-12-21
Last Modified: 2012-05-08
These are on my securty event logs - is someone trying to gain access not authorized?

Event Type:                              Failure Audit
Event Source:      Security
Event Category:      Account Logon
Event ID:                               680
Date:            12/21/2009
Time:            1:51:38 PM
User:            NT AUTHORITY\SYSTEM
Computer:                               XYSRVR1
 Logon account:      krbtgt
 Source Workstation:      \\NTscan
 Error Code:      0xC0000234
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Question by:zaldy
    LVL 9

    Expert Comment

    Something is trying to logon with an incorrect password. 0xC0000234 indicates an account lockout. Is it possible you have Blackberry or Windows based phones trying to logon, and the user has had a password change?
    LVL 12

    Accepted Solution

    Or that there's a connection from the host NTSCAN that is using old credentials - maybe a network drive, printer, etc.
    Use this blog post to check for cached credentials -

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