Change default port in RAC

Changed the database default port from 1521 to 1523 for resolve the “Oracle Database TNS Listener Poison Attack Vulnerability”.

1. Modify port using srvctl tool

srvctl modify scan_listener -p 1523
srvctl modify listener -p 1523

2. update the local and remote listener in spfile for all the respective nodes.

3. update the port information in Oracle Network files e.g. listener.ora and tnsnames.ora


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