This article contains tips for interpreting security auditing events
that are related to user authentication.
These events will all appear in the Security event log and will be logged
with a source of Security.
514 An authentication package has been loaded by the LSA
515 A trusted logon process has registered with the LSA
518 A notification package has been loaded by the Security
528 Successful Logon
529 Logon Failure: Unknown user name or bad password
530 Logon Failure: Account logon time restriction violation
531 Logon Failure: Account currently disabled
532 Logon Failure: The specified user account has expired
533 Logon Failure: User not allowed to logon at this computer
534 Logon Failure: The user has not been granted the requested
logon type at this machine
535 Logon Failure: The specified account's password has expired
536 Logon Failure: The NetLogon component is not active
537 Logon Failure: An unexpected error occurred during logon
538 User Logoff
539 Logon Failure: Account locked out
644 User Account Locked Out
For more information about security events, click the following article number to view the article in the Microsoft Knowledge Base:
Security event descriptions
Security identifiers (SIDs)
Some security events report SIDs instead of user names. In this case,
it is often difficult to determine which user account is being referred
to in the event.
It is possible to build a list of mappings of user names to SIDs by
performing the following steps:
- Dump the user list to a text file with the NET USERS command or with
- Modify this text file to remove unwanted information (headers, and so
- Modify the resulting list of user names into a batch file, using the
GETSID resource kit utility to translate each user name into a SID.
Redirect the output to a text file.
- When you encounter a SID, search the text file (created previously)
for that SID. This will place you on the line with the user's name.
"Logon Type" will be one of the following:
7 Unlock Workstation
(0 & 1 are invalid)
"Logon Process" will be one of the following:
"msv1_0" or "MICROSOFT_AUTHENTICATION_PACKAGE_V1_0":
msv1_0.dll, the default authentication package
ksecdd.sys, the security device driver
"User32" or "WinLogon\MSGina":
winlogon.exe & msgina.dll, the authentication user interface
The Service Control Manager
"LAN Manager Workstation Service"
API call to LogonUser
The RADIUS authentication package; a part of the Microsoft Internet
Authentication Services (IAS).
For more information about auditing user right changes, click the following article number to view the article in the Microsoft Knowledge Base:
Auditing user right assignment changes
For more information about user authentication, click the following article number to view the article in the Microsoft Knowledge Base:
NTLM user authentication in Windows
For more information about authentication on networks, click the following article number to view the article in the Microsoft Knowledge Base:
Example of remote logon with Windows NT Server