What can cause message UNABLE TO ESTABLISH XMANAGER CONNECTION when executing Post Install tasks for the CA Database Management Solutions for DB2 for z/OS?

Products

• RC Compare for DB2 for z/OS
• Bind Analyzer for DB2 for z/OS
• SQL-Ease for DB2 for z/OS
• SYSVIEW Performance Management Option for DB2 for z/OS
• Plan Analyzer for DB2 for z/OS
• Subsystem Analyzer for DB2 for z/OS
• Database Analyzer for DB2 for z/OS
• Fast Unload for DB2 for z/OS
• Fast Check for DB2 for z/OS
• Fast Index for DB2 for z/OS
• Rapid Reorg for DB2 for z/OS
• Endevor Software Change Manager (SCM)
• Endevor Software Change Manager - Natural Integration (SCM)
• Endevor Software Change Manager - ECLIPSE Plugin (SCM)
• Endevor Software Change Manager - Enterprise Workbench (SCM)

Issue/Introduction

Introduction: 

This article states why the Post Install Object Comparison job may fail with a "UNABLE TO ESTABLISH XMANAGER CONNECTION" error when installing a new release of CA DB2 tools for z/OS.

Question: 

What can cause message UNABLE TO ESTABLISH XMANAGER CONNECTION when executing Post Install tasks for the CA Database Management Solutions for DB2 for z/OS?

Environment:  

z/OS 1.11 and above.

Answer: 

The previous release XMANAGER task was running when the install was being done caused the problem. The release associated with the XMANAGER task must match the release of the products being installed or accessed. A new XMANAGER task must be started under the current maintenance release being installed to resolve this problem.

Environment

Release:
Component: ENDBAS