Oracle Database Listener Security Guide

The Oracle Database Listener is the database server software component that manages the network traffic between the Oracle Database and the client. The Oracle Database Listener listens on a specific network port (default 1521) and forwards network connections to the Database. The Listener is comprised of two binaries: (1) tnslsnr which is the Listener itself and (2) the Listener Control Utility (lsnrctl) which is used to administer the Listener on the server or remotely.

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