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Cannot understand why the iuser_{machinename} is logged as in the event as logon failure: The user had not been granted the requested logon type at this machine. Thank you

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Sounds like an issue with User Rights Assignments for the anonymous access account in IIS. See the following Microsoft KB:

Error message when you try to view a Web site that is hosted on Internet Information Server 6.0 by using anonymous access: "401.1 Unauthorized: Logon failed"

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Very good. WE are checking our settings; Thank you for your comments to this question.! – Marcia Apr 19 '12 at 14:47

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