Event ID - 11512

Event Id11512
DescriptionThe authentication package DPA could not be found in the Available-Authorization-Packages attribute.
Event InformationAccording to Microsoft:
This occurs if the Exchange Service Account administrator is not an administrator of the Windows NT domain or computer.Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0. This problem was corrected in the latest Microsoft Exchange Service Pack.
Reference LinksXFOR: Authentication Package DPA Errors

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