IIS Anonymous access. Unknown user name or bad password

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    I donno whether this will fit into this topic or not. But i faced this issue yesterday and my boss needs an explanation. I am already trying :google: . But may use the expertise of you guys in this forum.

    LOG:

    Event Type: Warning
    Event Source: W3SVC
    Event Category: None
    Event ID: 100
    Date: 8/10/2009
    Time: 9:13:19 AM
    User: N/A
    Computer: ABC
    Description:
    The server was unable to logon the Windows NT account ‘DomainUSER’ due to the following error: Logon failure: unknown user name or bad password. The data is the error code.
    For additional information specific to this message please visit the Microsoft Online Support site located at: http://www.microsoft.com/contentredirect.asp.

    For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
    Data:
    0000: 2e 05 00 00 ….

    ISSUE:

    IIS Anonymous access for a Virtual directory in the server ABC has configured under the “DomainUSER” to run.

    I was going thru the IIS settings to fix another security scan result. Maybe i clicked “OK” button at some point in the IIS Config box after checking the Integrated Windows Authentication Check box.

    This Virtual directory settings has not been changed ever since i remember. But suddenly it said the Password provided is wrong and started to Lock the DomainUSER account. When i changed the ID in the IIS Virtual Directory to another Domain ID, it started working fine.

    Log:

    Event Type: Failure Audit
    Event Source: Security
    Event Category: Logon/Logoff
    Event ID: 529
    Date: 8/10/2009
    Time: 9:13:19 AM
    User: NT AUTHORITYSYSTEM
    Computer: ABC
    Description:
    Logon Failure:
    Reason: Unknown user name or bad password
    User Name: USER
    Domain: Domain
    Logon Type: 2
    Logon Process: IIS
    Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
    Workstation Name: ABC
    For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

    Question:

    How can the password be wrong if it has been there for a long time?

    Norbert

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