Explanation of Registered vs Unregistered Status for a collection client within the Remote Client Install GUI.
A machine that appears as 'registered' means that the RCI has found the machine in the ZAM database (NC_Workstation) by machine name.
A machine that appears as 'not registered' means that the RCI did not locate the machine in the ZAM database by machine name.
'Registered' does not mean that the client is installed. It only means that the client was once installed which is why the'Last Contact' column is also shown in the Workstation List pane. Together with the status and Last Contact column should the operator discern whether or not the ZAM Client is actually installed. If the workstation has not contacted a collection server in over a month, you can assume that the client is no longer installed.
The RCI lists
machines in the 'Client Not Found' branch are reported directly
from the same tables that the webconsole uses. If NetworkDiscovery
did not find a client then a) it is no longer installed on the
machine; b) something interfered with the ND ability to recognize
the client; c) something is wrong with the ND reconciler.