Pre-authentication failed

Operating SystemsWindows Server 2000
Windows 2003 and XP

CategoryAccount Logon
Type Failure


Corresponding events
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.

See Also: Special groups have been assigned to a new logon

Do you think you're fascinated in entering into pc security employment? If that's the case then in this article you may figure out all the things you need to know with regard to the task description and everything you may wind up accomplishing also as being the skills needed. What does Laptop Protection Involve?

Laptop protection is a department of data know-how that relates precisely to actions taken to guard the info on computer systems from staying corrupted or misused. Laptop stability arrives in a myriad of various forms based on what degree of defense is required.

It is actually extremely critical for individuals applying computer systems to protect their personal computer from details loss, misuse, and abuse. One example is, it's very important for corporations to maintain facts they've secure so that hackers won't be able to accessibility the knowledge. Home buyers also need to get signifies to make sure that their bank card figures are protected when they are taking part in on the internet transactions. Examine the threats and the way to reduce them in this article.

Phyllis Buckles
I'm an Information Security Engineers, also called Information Security Analysts, help to safeguard organization's computer networks and systems. Planning and carrying out security measures to monitor and protect sensitive data and systems from infiltration and cyber-attacks.