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Could not retrieve a valid windows identity - access is denied

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Background:

We have a reporting solution based on SQL Server 2012 SP1 running on Server 2008 R2. Users access the solution through SharePoint 2013. We have several hundred users and all is well with the exception of 2 users.

Problem:

When these 2 users try and open a SSRS report they receive an error. The entry is the SharePoint log reads:

SPSecurityContext.WindowsIdentity: Could not retrieve a valid windows identity for NTName='domain\username', UPN='user.name@email.com'. UPN is required when Kerberos constrained delegation is used. Exception: System.ServiceModel.Security.SecurityAccessDeniedException: Access is denied.

Other details (thoughts):

We are confident that Kerberos and C2WTS are set up and working correctly (we have a couple of hundred users working).

We suspect it may be Active Directory related but can find nothing that sets the users apart from everyone else.

Has anyone any suggestions to resolve this?


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