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You may need to change your database listener port. In this post we will do it together by following below steps

1. Log in to the Linux operating system as the oracle user.
2. Check the current listening status by using below command:
   lsnrctl status LISTENER

PS: On many system default listener name is LISTENER and default listener port is 1521 by default. You can check your listener name by using (ps -ef|grep tns) command