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.

What is an event ID 675 in Win2K?

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.

What do the Kerberos event failure codes mean?

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. Check the User ID field.

What is security event 4771(F) Kerberos pre-authentication failed?

Describes security event 4771(F) Kerberos pre-authentication failed. This event is generated when the Key Distribution Center fails to issue a Kerberos TGT.

How to troubleshoot a failed upgrade that returns result code 0xc1900101?

To troubleshoot a failed upgrade that has returned a result code of 0xC1900101, analyze the extend code to determine the Windows Setup phase, and see the Resolution procedures section later in this article. The following set of result codes are associated with Windows Setup compatibility warnings:

What does error code 0xc1900101 mean?

A result code of 0xC1900101 is generic and indicates that a rollback occurred. In most cases, the cause is a driver compatibility issue. To troubleshoot a failed upgrade that has returned a result code of 0xC1900101, analyze the extend code to determine the Windows Setup phase, and see the Resolution procedures section later in this article.