Pre-requisite: RA certificate caching must be enabled.
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Logon as Domain administrator
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Start Active Directory Users and computers
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Make sure in View menu you have Advanced Features enabled:
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Search for user you are using for authentication:
Make a right-click and select Name Mappings
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Add user´s certificate (found on previous chapter Verify certificate Subject Alt Name (SAN), point 3)
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Try to authenticate. If this helps resolve the issue, problem is on correct mapping of certificate to AD account.
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Remove explicit mapping. This is only for testing.