You have just run this syntax to start the listener from the Listener Control utility: LSNRCTL>START Starting /mstgelai/oracle/bin/tnslsnr: please wait... System parameter file is /u01/oracle/network/admin/listener.ora Log messages written to /u01/oracle/network/log/listener.log Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=stc-sun01-server)(PORT=1521))) Connecting to... The command completed successfully What is the name of the Listener you started?