Operating SystemsWindows Server 2000
Windows 2003 and XP
in Windows 2008
and Vista 4771
When a user attempts to log on at a workstation and uses a valid domain account name but enters a bad password, the DC records event ID 675 (pre-authentication failed) with Failure Code 24. By reviewing each of your DC Security logs for this event and failure code, you can track every domain logon attempt that failed as a result of a bad password. In addition to providing the username and domain name, the event provides the IP address of the system from which the logon attempt originated.
Win2K also logs event ID 675 when a user attempts to use a different username (i.e., a username other than the one he or she used for the current workstation logon) to connect to a server. For example, a user might try to use the Connect using a different user name feature to use someone else’s account to map a drive to a server.
This event can be logged for a few other reasons which are specified in the failure code. All Kerberos event failure codes correspond to the error codes defined by the Kerberos standard (RFC 1510). Click here for an explanation of failure codes.
Recommended response for failed instances of this event:
Check the User ID field. Most events generated by computer accounts are safe to ignore. Determine the reason for the authentication failure by checking Failure Code. TGT failures are usually due to a bad password or time synchronization between workstation and domain controller. If Failure Code indicates a bad password, how many failures exist for the same account? Look at the client IP address. Is an innocent user error or malicious attack indicated. If practical contact user regarding their recent logon attempts.
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