Novell ZENworks 10 Configuration Management with Support Pack 3 - 10.3
'2.1 Viewing the Agent's Status
Device State The device's state: managed, unmanaged, retired, or unknown. Unknown displays only if there is an error.'
Unable to determine the cause of the error resulting in the 'Unknown ' Agent Status for the first Primary server in the Zone.
No other Agent Status in the Zone has the 'Unknown ' status.
Additional DNS Name at Device Level caused the error. After removing the additional DNS Name at the device level the Agent Status is normal (green).