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.

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EventID   Description
-------   -----------
   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
           Account Manager
   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:

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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:

1.	Dump the user list to a text file with the NET USERS command or with Addusers.exe.
2.	Modify this text file to remove unwanted information (headers, and so forth).
3.	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.
4.	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.

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Logon type

"Logon Type" will be one of the following:

   2  Interactive
   3  Network
   4  Batch
   5  Service
   6  Proxy
   7  Unlock Workstation
   (0 & 1 are invalid)
				

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Logon Process

"Logon Process" will be one of the following:

  "msv1_0" or "MICROSOFT_AUTHENTICATION_PACKAGE_V1_0":
     msv1_0.dll, the default authentication package

  "KSecDD":
     ksecdd.sys, the security device driver

  "User32" or "WinLogon\MSGina":
     winlogon.exe & msgina.dll, the authentication user interface

  "SCMgr":
     The Service Control Manager

  "LAN Manager Workstation Service"

  "advapi"
   API call to LogonUser

  "MS.RADIU":
    The RADIUS authentication package; a part of the Microsoft Internet
    Authentication Services (IAS).
				

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User rights

For more information about auditing user right changes, click the following article number to view the article in the Microsoft Knowledge Base:

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Supplemental information

For more information about user authentication, click the following article number to view the article in the Microsoft Knowledge Base: For more information about authentication on networks, click the following article number to view the article in the Microsoft Knowledge Base:

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