Event ID - 537

Event Id537
DescriptionLogon Failure:
Reason: An unexpected error occurred during logon
User Name: <User Name>
      Domain: <Domain>
      Logon Type: <Logon Type>
      Logon Process: <Logon Process>
      Authentication Package: <Authentication Package>
      Workstation Name: <Workstation Name>     

Event InformationAccording to Microsoft :
Cause :
This event record indicates that a logon attempt was made and rejected for some reason other than those covered by explicit audit records in this category.

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This problem occurs because Winlogon.exe incorrectly tries a cached logon process for the user who is logging on to the local computer.

Service pack information:
To resolve this problem, obtain the latest service pack for Microsoft Windows XP.
Hotfix information:
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows XP service pack that contains this hotfix.

In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Reference LinksEvent ID 537 from Source Security

Alternate Event ID in Vista and Windows Server 2008 is 4625.

Tracking Logon and Logoff Activity in Windows 2000 (Article)

Tracking User Activities (White Paper)

Duplicate Server Names Cause Event Log 537 with FPNW Installed

MS02-001: Forged SID Could Result in Elevated Privileges in Windows 2000

Cannot Log On to a Heavily Loaded Exchange Server 2003 Computer by Using Outlook Mobile Access

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