Solved

Failure audit Kerberos error 0x6 Event ID 672

Posted on 2011-02-24
1
3,621 Views
Last Modified: 2012-05-11
Hi,

I have been getting failure audit messages in the security log on all DC's in the domain.
It looks like somebody is trying to get into the AD from a member server in our domain.

The user name "sw1tchu$er" doesn't exist in the domain.
I have also noticed that the same was happening for the existing "support" user account that we have on the domain. Therefore I have disable this account, causing the Event ID 675 listed below (it was getting locked out before it got disabled).

Both events have the same client IP address. Changing the IP address didn't stop the problem.
When the member server was shut down, the failure audit messages stopped.
I have also tried a few programs like Spybot, HijackThis etc. without any success on the member server.
All servers in the AD (Windows 2003 Server) are fully patched and have AV software installed.
The firewall (CISCO ASA) is in stealth mode, no open ports are visible.

I am open to any suggestions.
Thanks in advance.


Failure audit Event ID 672

Authentication Ticket Request:
       User Name:            sw1tchu$er
       Supplied Realm Name:      mydomain.LOCAL
       User ID:                  -
       Service Name:            krbtgt/mydomain.LOCAL
       Service ID:            -
       Ticket Options:            0x40810010
       Result Code:            0x6
       Ticket Encryption Type:      -
       Pre-Authentication Type:      -
       Client Address:            member server IP
       Certificate Issuer Name:      
       Certificate Serial Number:      
       Certificate Thumbprint:      


Failure audit Event ID 675

Authentication Ticket Request:
       User Name:            support
       Supplied Realm Name:      mydomain.local
       User ID:                  -
       Service Name:            krbtgt/mydomain.local
       Service ID:            -
       Ticket Options:            0x40810010
       Result Code:            0x12
       Ticket Encryption Type:      -
       Pre-Authentication Type:      -
       Client Address:            member server IP
       Certificate Issuer Name:      
       Certificate Serial Number:      
       Certificate Thumbprint:      


0
Comment
Question by:drula
1 Comment
 
LVL 38

Accepted Solution

by:
Adam Brown earned 500 total points
ID: 34974505
The 672 error looks like someone put their password in as their user name. That can happen, and it is always logged with the 672 error when it happens. Usually if you look at the following success events if they are logged you can figure out which user is having issues. The 675 error looks to be a logon hours restriction violation. When a user is logged in when they have logon restrictions invoked on their account, the 675 event (with result code of 12) signifies that they are still logged in.

http://www.windowsecurity.com/articles/Kerberos-Authentication-Events.html will give you more information.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
In this article, I am going to show you how to simulate a multi-site Lab environment on a single Hyper-V host. I use this method successfully in my own lab to simulate three fully routed global AD Sites on a Windows 10 Hyper-V host.
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles from a Windows Server 2008 domain controller to a Windows Server 2012 domain controlle…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now