The reason is the Serena Watcher SVC Exit has not been granted with the required RAC privilege as described in the Z/os user guide , in paragraph "Installing the Serena Watcher SVC Exit" . Giving the required RACF privilege to the SVC and resubmitting the build fixes the error
Connection failed. Please ensure that you run the utility under dimensions administrator account. If you are performs remote migration please see user guide for additional settings
