PI70907: IN Z/OS EXPLORER 3.0.0.6, MULTIPLE RSE CONNECTIONS ON DIFFERENT PORTS IN HOST CONNECTIONS CANNOT CONNECT SIMULTANEOUSLY

APAR status

• Closed as program error.

Error description

• In z/os Explorer 3.0.0.6, only one successfully connected RSE
  connection is possible in Host Connections.  Multiple RSE
  connections on different ports are rejected.
  
  To recreate:
  1) Create a successful RSE connection on one port.
  2) Create a second RSE connection on a different port.
  3) Attempt to connect the second RSE connection.
  The first RSE connection will be disconnected.
  

Local fix

Problem summary

• RSE Connections allow more than one to be active, so you can
  connect to 1, 2, 3... different RSE hosts.
  FTP Connections to z/OS only allow one to be active, so once the
  2nd connects it disconnects the first connection.
  
  The Host Connections view that shows both RSE and FPT
  connections beneath the z/OS connection type, was treating RSE
  connections as though they could only be active one at a time
  which was incorrect.
  
  The Host Connections view was allowing an RSE connection to be
  establish through its "Connect" button/menu action.  When the
  2nd RSE connection was made through the Host Connections view it
  did a disconnect on the first connection because it was treating
  it as though had an FTP type behaviour where only one could be
  active.
  
  If an RSE Connection was made in the Remote Systems Explorer
  view, then this was working to allow 1, 2, 3, ... connections -
  but it was not notifying the Host Connections view (or trim
  widget) so a user would look at Host Connections and see
  inconsistency.
  

Problem conclusion

• The Host Connections view and its accompanying framework (that
  is used by the trim widget) is updated so that when an RSE
  Connection is connected it does not disconnect any existing
  active RSE Connections.  It will disconnect an FTP connection
  though and replace the "active" z/OS connection with the RSE one
  so that the UNIX files view (which is populated by RSE) gets
  its content from RSE.
  
  If an FTP connection is made it will disconnect an existing FTP
  connection, but it will not disconnect an RSE connection.
  
  Notification listeners are added into Remote Systems Explorer
  framework so that when an RSE Connection to a z/OS System is
  made the Host Connections view (and framework that provides the
  trim widget) is updated to show the correct status - likewise
  for disconnect.
  
  When an RSE Connection is made the previous connection is
  remembered, so that when a connection is disconnected in RSE and
  the z/OS perspective's user interface views, the last known
  connected connection is then switched to be the  "active"
  connection so that the data sets/UNIX Files/JES tree view are
  populated.
  
  This APAR will be available in IBM Explorer for z/OS 3.0.1.5
  Fixpack located here:
  https://developer.ibm.com/mainframe/products/downloads/
  

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

  EXP FOR Z/OS CL

• Fixed component ID

  5655EXP00

Applicable component levels

• R301 PSY

     UP