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Event ID 2160 is logged in the Application log after you map a user to a certificate in Exchange Server 2010
Article ID: 2737853 - View products that this article applies to.
Assume that you use one of the following account mapping methods together with the altSecurityIdentities attribute to map a user to a certificate in Microsoft Exchange Server 2010:
Log Name: Application
Source: MSExchange ADAccess
Event ID: 2160
Process w3wp.exe (). Recipient object CN=<User>,OU=Users,OU=site,DC=lab,DC=contoso,DC=com read from DC.domain.com failed validation and will be excluded from the result set. Set event logging level for Validation category to Expert to get additional events about each failure.
This issue occurs because Exchange Server 2010 does not support the account mapping methods that are listed in the "Symptoms" section.
To resolve this issue, use the following account mapping methods that are supported by Exchange Server 2010:
Active Directory 2008 enables alternative account mappings by using the altSecurityIdentities attribute. This attribute contains the user’s certificate information that is used by the Kerberos Authentication service to identify the associated Active Directory user account.
For more information about how to map a user to a certificate, go to the following Microsoft website:
How to map a user to a certificate by using all the methods that are available in the altSecurityIdentities attribute
Article ID: 2737853 - Last Review: August 3, 2012 - Revision: 1.0