PH11844: Joining a member to a pre-18.0.0.2 controller fails with default collective-wide ssh key

19.0.0.5: WebSphere Application Server Liberty 19.0.0.5
19.0.0.6: WebSphere Application Server Liberty 19.0.0.6
19.0.0.7: WebSphere Application Server Liberty 19.0.0.7
19.0.0.8: WebSphere Application Server Liberty 19.0.0.8
19.0.0.9: WebSphere Application Server Liberty 19.0.0.9
19.0.0.10: WebSphere Application Server Liberty 19.0.0.10
19.0.0.11: WebSphere Application Server Liberty 19.0.0.11
19.0.0.12: WebSphere Application Server Liberty 19.0.0.12
20.0.0.1: WebSphere Application Server Liberty 20.0.0.1
20.0.0.2: WebSphere Application Server Liberty 20.0.0.2
20.0.0.3: WebSphere Application Server Liberty 20.0.0.3
20.0.0.4: WebSphere Application Server Liberty 20.0.0.4
20.0.0.5: WebSphere Application Server Liberty 20.0.0.5

APAR status

• Closed as program error.

Error description

• Joining a collective member to a back level collective
  controller fails when the collective is configured to use a
  collective-wide ssh key.
  

Local fix

• Workaround:
  
  Add the member using the same level the controller has
  Once the member has been joined, upgrade the member
  to the new Fix Pack level.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Liberty ND collectives               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Joining a member at 18.0.0.2 or later   *
  *                      to a controller at 18.0.0.1 or earlier  *
  *                      fails.                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Joining a member at 18.0.0.2 or later to a controller at
  18.0.0.1 or earlier fails with
  Error: CWWKX0218E: The MBean
  'WebSphere:feature=collectiveController,type=CollectiveRegistrat
  ion,name=CollectiveRegistration' does not have an attribute by
  the name 'PublicSSHKey'.
  
  When collective join option --useCollectiveSSHKey=false is
  specified it fails with
  Error: java.lang.IllegalArgumentException: CWWKX9012E: The
  CollectiveRegistration MBean join operation could not be
  completed. There is an unrecognized property:
  collectiveSSHKeySupported.
  

Problem conclusion

• Level detection is corrected so that join works with default
  options and fails with specific error message when incompatible
  option --useCollectiveSSHKey=true is used.
  
  The fix for this APAR is currently targeted for inclusion in fix
  pack 19.0.0.5.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  LIBERTY PROFILE

• Fixed component ID

  5724J0814

Applicable component levels

• R850 PSY

     UP