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Security Event Log - 4625

Christopher Hand
Last Modified: 2018-02-08
Hello - I have been trying to troubleshoot this issue for days now and I am coming up empty. Some service or task is trying to, as I understand, access EHP1SRV01 (DC), with my credentials of 'chand'. I think maybe why it is failing is because it doesn't have my latest password updated or it needs the domain 'EHP1\chand'. Not sure. Any help is appreciated. Below is the error message I keep receiving. About 1000+ every 2 minutes.

An account failed to log on.

      Security ID:            SYSTEM
      Account Name:            EHP1SRV01$
      Account Domain:            EHP1
      Logon ID:            0x3e7

Logon Type:                  3

Account For Which Logon Failed:
      Security ID:            NULL SID
      Account Name:            chand
      Account Domain:            EHP1

Failure Information:
      Failure Reason:            Unknown user name or bad password.
      Status:                  0xc000006d
      Sub Status:            0xc000006a

Process Information:
      Caller Process ID:      0x344
      Caller Process Name:      C:\Windows\System32\lsass.exe

Network Information:
      Workstation Name:      EHP1SRV01
      Source Network Address:
      Source Port:            55267

Detailed Authentication Information:
      Logon Process:            Advapi  
      Authentication Package:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
      Transited Services:      -
      Package Name (NTLM only):      -
      Key Length:            0

This event is generated when a logon request fails. It is generated on the computer where access was attempted.

The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.

The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).

The Process Information fields indicate which account and process on the system requested the logon.

The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.

The authentication information fields provide detailed information about this specific logon request.
      - Transited services indicate which intermediate services have participated in this logon request.
      - Package name indicates which sub-protocol was used among the NTLM protocols.
      - Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
Watch Question

ChrisSr. Systems Engineer

Do you have any services setup to run with your credentials?

Have you changed your password recently?
Christopher HandIT Network Engineer


Chris - I checked services.msc and none of the services use my domain account. Yes, I changed my password quite a few months back. I believe the errors started then. However, I'm not sure how to pin point what task or service is trying to use my account. So frustrating.
Christopher HandIT Network Engineer


Here is the other error which may be helpful:

The computer attempted to validate the credentials for an account.

Authentication Package:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon Account:      chand
Source Workstation:      EHP1SRV01
Error Code:      0xc000006a
Christopher HandIT Network Engineer


I followed these directions and attached the netlogon.log file

Solution: We had to put the domain controller in verbose logging for the netlogon service to actually find out where the logon attempt was coming from.

First, open up command prompt as an administrator and execute the following command:

nltest /dbflag:0x2080ffff

Once done, execute the following command to turn off the debugging:

nltest /dbflag:0x0

This logs every transaction made to the file: %windir%\debug\netlogon.log (note, you need to run notepad as an administrator to read this file).
Christopher HandIT Network Engineer


Here is the file.
ChrisSr. Systems Engineer

Hi Chris,

Unfortunately, the log just seems to point to the DC.
Are you syncing your phone or mobile device to your account?

In my experience, these 99.9% of these types of events are typically caused 1 of 2 ways.

1> a service account of some type is running using your username/password, but your credentials changed/expired.
2> a mobile device is attempting to authenticate, but your credentials changed/expired.
Christopher HandIT Network Engineer


Thanks for getting back to me, Chris.
I am not syncing any type of mobile device to my account. It is probably a service using my old credentials, I just have to find which one it is.

I did change my domain password which then it locked me out of my account after next login. I am no longer getting that first error message but the second one I posted above, I am still receiving.

At this point I just have to browse and think of what is trying to access my account. Could it be a service on my local machine even if the error points to the DC?
Sr. Systems Engineer
This problem has been solved!
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Christopher HandIT Network Engineer


Oh brother. That is going to take forever. I would have to go to each and every machine on the network and check each scheduled task. Is that the most feasible option right now? Isn't there a program that can do it for me?
Christopher HandIT Network Engineer


I finally figured it out. I noticed the source network address of the error was coming from our firewall appliance. Apparently I used my personal credentials to configure LDAP. I updated the credentials and the errors in Event Viewer disappeared and now my account no longer is being locked every 10 seconds.
Thanks for your assistance and for pointing me in the right direction, Chris.
ChrisSr. Systems Engineer

Sure man! Great to hear you figured it out. Happy to help!  :-)

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