Summary Configure the Shared mode for Oracle connection, it failed and returned ORA-12523, found out it is mandatory to configure local listener. 本地监听的配置是必须的。 Configure Shared server mode ‘listener.ora’ was configured as below, LISTENER3 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = ocp)(PORT = 1523)) ) LISTENER2 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST […]