Discoverer Plus/Viewer 11g Fails with the error: The Network Adapter Could Not Establish The Connection (Doc ID 1262972.1)

Trying to launch Discoverer Plus or Viewer 11g fails with error:

A connection error has occurred.
- error while creating the session, check for other errors.
- oracle.discoiv.connections.ConnectionStoreException: weblogic.common.resourcepool.ResourceDeadException: 0:weblogic.common.ResourceException: Could not create pool connection. The DBMS driver exception was: The Network Adapter could not establish the connection
- weblogic.common.resourcepool.ResourceDeadException: 0:weblogic.common.ResourceException: Could not create pool connection. The DBMS driver exception was: The Network Adapter could not establish the connection
- weblogic.common.resourcepool.ResourceDeadException: 0:weblogic.common.ResourceException: Could not create pool connection. The DBMS driver exception was: The Network Adapter could not establish the connection
unable to retrieve connection list
- Cannot retrieve connection list. Check the Discoverer application log for more details.

Starting WLS_DISCO gives errors:

Changes

After installation and configuration of Discoverer 11g the port number was changed for the database holding the DISCOVERER schema created by Repository Creation Utility (RCU).

Cause

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