I have a user within the organization logging into a domain authenticated machine with an active directory account. They are able to login to the machine without issue while connected to the network, however, periodically throughout their day (every 10 minutes
or so) have their account lock.
The user machine is on Windows 7 Enterprise (64-bit), if that matters. I've ensured that all stored credentials on the local machine have been cleared, I've checked SAM for duplicate SIDs, and I've scoured the domain controllers for some clue as to why this
is happening. They do not have any manually mapped drives with stored creds, web data, or attached mobile devices. The two events I see on the DC related to this lockout are as follows:
Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: 10/13/2015 3:59:34 PM
Event ID: 4625
Task Category: Logon
Level: Information
Keywords: Audit Failure
User: N/A
Computer: %domainController.domain.com%
Description:
An account failed to log on.
Subject:
Security ID: SYSTEM
Account Name: %domainController%$
Account Domain: %domain%
Logon ID: 0x3E7
Logon Type: 3
Account For Which Logon Failed:
Security ID: NULL SID
Account Name: %username%
Account Domain: %domain%
Failure Information:
Failure Reason: Unknown user name or bad password.
Status: 0xC000006D
Sub Status: 0xC000006A
Process Information:
Caller Process ID: 0x388
Caller Process Name: C:\Windows\System32\svchost.exe
Network Information:
Workstation Name:
Source Network Address: -
Source Port: -
Detailed Authentication Information:
Logon Process: CHAP
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.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" /><EventID>4625</EventID><Version>0</Version><Level>0</Level><Task>12544</Task><Opcode>0</Opcode><Keywords>0x8010000000000000</Keywords><TimeCreated SystemTime="2015-10-13T19:59:34.580228600Z" /><EventRecordID>268619882</EventRecordID><Correlation /><Execution ProcessID="496" ThreadID="9756" /><Channel>Security</Channel><Computer>%domainController.domain.com%</Computer><Security /></System><EventData><Data Name="SubjectUserSid">S-1-5-18</Data><Data Name="SubjectUserName">%domainController%$</Data><Data Name="SubjectDomainName">%domain%</Data><Data Name="SubjectLogonId">0x3e7</Data><Data Name="TargetUserSid">S-1-0-0</Data><Data Name="TargetUserName">%username%</Data><Data Name="TargetDomainName">%domain%</Data><Data Name="Status">0xc000006d</Data><Data Name="FailureReason">%%2313</Data><Data Name="SubStatus">0xc000006a</Data><Data Name="LogonType">3</Data><Data Name="LogonProcessName">CHAP</Data><Data Name="AuthenticationPackageName">MICROSOFT_AUTHENTICATION_PACKAGE_V1_0</Data><Data Name="WorkstationName"></Data><Data Name="TransmittedServices">-</Data><Data Name="LmPackageName">-</Data><Data Name="KeyLength">0</Data><Data Name="ProcessId">0x388</Data><Data Name="ProcessName">C:\Windows\System32\svchost.exe</Data><Data Name="IpAddress">-</Data><Data Name="IpPort">-</Data></EventData></Event>
and
Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: 10/13/2015 3:59:34 PM
Event ID: 4776
Task Category: Credential Validation
Level: Information
Keywords: Audit Failure
User: N/A
Computer: %domainController.domain.com%
Description:
The computer attempted to validate the credentials for an account.
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon Account: %username%
Source Workstation:
Error Code: 0xC000006A
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" /><EventID>4776</EventID><Version>0</Version><Level>0</Level><Task>14336</Task><Opcode>0</Opcode><Keywords>0x8010000000000000</Keywords><TimeCreated SystemTime="2015-10-13T19:59:34.580228600Z" /><EventRecordID>268619881</EventRecordID><Correlation /><Execution ProcessID="496" ThreadID="9756" /><Channel>Security</Channel><Computer>%domainController.domain.com%</Computer><Security /></System><EventData><Data Name="PackageName">MICROSOFT_AUTHENTICATION_PACKAGE_V1_0</Data><Data Name="TargetUserName">%username%</Data><Data Name="Workstation"></Data><Data Name="Status">0xc000006a</Data></EventData></Event>
Is there something I am not seeing? I'm at a loss at this point so any expert opinions are welcome. Thank you.