2159519 - "User is missing credentials for connecting to alias..." on UWL due to incorrect trust setup [VIDEO]

When trying to register a system within UWL, an error similar to the following is returned:

(Connector) :com.sap.netweaver.bc.uwl.connect.ConnectorException:Tue Mar 17 17:41:01 EDT 2015
(Connector) :com.sap.portal.connectivity.destinations.PortalDestinationsServiceException:User is missing credentials for connecting to alias <system_alias>. Contact your system administrator.

These messages appear in the UWL Administration UI (as highlighted below):

 

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• SAP Universal Worklist (UWL)
• SAP Enterprise Portal 
• SAP NetWeaver Application Server Java

SAP NetWeaver 7.0 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP NetWeaver Application Server for Java 7.1 ; SAP NetWeaver Application Server for Java 7.2 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 1 for SAP NetWeaver Application Server for Java 7.1 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

KBA , gscbrazil_video , video , gscbrazil , exception , rfc_error_logon_failure , connectionfailedexception , issuer of sso ticket is not authorized , EP-BC-UWL , Universal Worklist , Problem