﻿UltimateWindowsSecurity.com Forum / Ultimate Windows Security Forum / Security Log / 675 - Pre-authentication failed InstantForum.NET v4.1.4UltimateWindowsSecurity.com Forumhttp://forum.ultimatewindowssecurity.com/noreply@ultimatewindowssecurity.comWed, 15 Jul 2020 23:11:40 GMT20Tracking Authentication failire 675 triggered due to Keyboard interactive Loginhttp://forum.ultimatewindowssecurity.com/Topic1226-123-1.aspxHello Team</p><p>Is there any option to track 675 events triggered by key board interactive method. 675 event does not capture logon method. The difference between 529 and 675 events are understood clearly however I would like to know how to filter out authentication failure happened via keyboard interaction from a source machine.Tue, 04 Jun 2013 05:04:02 GMTsecurity_Analyst_IndiaPre-Authentication failed (675)http://forum.ultimatewindowssecurity.com/Topic804-123-1.aspxWhat does the Failure Code: 0x19 really telling me in this example:<PRE>WinEvtLog: Security: AUDIT_FAILURE(675): Security: SYSTEM: NTAUTHORITY: DC-1: Pre-authentication failed: User Name: backup User ID: %{S-1-5-21-3051321540-3826193667-1811533274-6135} Service Name: krbtgt/Domain Pre-Authentication Type: 0x0 Failure Code: 0x19 Client Address: ** Alert1316528955.302820297: - windows,authentication_success, SYSTEM </PRE><PRE> </PRE>Tue, 20 Sep 2011 10:44:11 GMThgarciaPre-authentication errors filling DC security loghttp://forum.ultimatewindowssecurity.com/Topic111-123-1.aspxSorry about that Randy. I should have thought of that. Anyways, copied the entire posting over as you have instructed.</P><P>Thank for the update Randy, but I went ahead and add the successful/failures for Logon/Logoff and Account Login events to the Default Domain Controller Policy and applied the new GPO to member servers. This seems to be working well and will address the issue at a later time. In the meantime, not being an expert in Windows Logs like you, I am having some trouble deciphering the logs. For some reason, I keep getting 675 on the DC's (see below), and do not understand them since these are computer accounts. Can you explain this to me? </P><P>Event Type: Failure Audit<BR>Event Source: Security<BR>Event Category: Account Logon <BR>Event ID: 675<BR>Date: 6/11/2009<BR>Time: 12:01:03 AM<BR>User: NT AUTHORITY\SYSTEM<BR>Computer: EXCHCLE<BR>Description:<BR>Pre-authentication failed:<BR> User Name: DPM2K7$<BR> User ID: domain\DPM2K7$<BR> Service Name: krbtgt/FQDN<BR> Pre-Authentication Type: 0x0<BR> Failure Code: 0x19<BR> Client Address: IPAddress</P><P><BR>For more information, see Help and Support Center at <A href="http://go.microsoft.com/fwlink/events.asp">http://go.microsoft.com/fwlink/events.asp</A>.</P><P>I seem to be getting a lot of these in the logs, and don't know what or where they are coming from. I have searched Google but not a lot of information on this other than your article from Windows IT Pro. HELP!!!<BR>Thu, 11 Jun 2009 10:39:59 GMTcmpyxFailure Code 0x18 for Computer accountshttp://forum.ultimatewindowssecurity.com/Topic506-123-1.aspxHi,<br><br>May we ask your help on several audit failures also filling up our DC logs:<br><br>Log is from our Win2k DC:<br><br>User: SYSTEM<br>WinEvtLog: Security: AUDIT_FAILURE(675): Security: SYSTEM: NT AUTHORITY: DC: Pre-authentication failed: [b]User Name: Workstation$[/b] User ID: %{S-1-5-21-2995177579-405588783-4148359246-5627} Service Name: krbtgt/DOMAIN Pre-Authentication Type: 0x2 [b]Failure Code: 0x18[/b] Client Address: XXX.XXX.XXX.XXX<br><br>Just would like to ask what are the possible causes for this event.<br><br>Thanks in advance!<br>Wed, 03 Nov 2010 23:49:50 GMTencrypted84difference between 675 and 529 event idshttp://forum.ultimatewindowssecurity.com/Topic489-123-1.aspxHi Randy,<P>I've just started analyzing Windows event viewer logs (i have knowledge of unix logs but never worked on windows logs before this). I have a query for you:</P><P>what is the difference between event ids 675 and 529? I understand both are used to indicate that login / authentication failed for given user, but am not able to decide which event id to focus on.</P><P>Thanks,</P><P>Mohit Vohra.Mon, 04 Oct 2010 04:58:27 GMTmohitvohra109