If you wish to change the scan listener port post installation, then follow below steps.
Here we will change the port from 1521 to 1585.
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1. Check the scan listener configuration
[oracle@jack oracle]$ srvctl config scan_listener
SCAN Listeners for network 1:
Registration invited nodes:
Registration invited subnets:
Endpoints: TCP:1521
SCAN Listener LISTENER_SCAN1 exists
SCAN Listener is enabled.
SCAN Listener LISTENER_SCAN2 exists
SCAN Listener is enabled.
SCAN Listener LISTENER_SCAN3 exists
SCAN Listener is enabled.
2. Modify the port using srvctl
[oracle@jack oracle]$ srvctl modify scan_listener -p 1585
3. Restart the scan_listener
[oracle@jack oracle]$ srvctl stop scan_listener
[oracle@jack oracle]$ srvctl start scan_listener
4. Check the configuration again
[oracle@jack oracle]$ srvctl config scan_listener
SCAN Listeners for network 1:
Registration invited nodes:
Registration invited subnets:
Endpoints: TCP:1585
SCAN Listener LISTENER_SCAN1 exists
SCAN Listener is enabled.
SCAN Listener LISTENER_SCAN2 exists
SCAN Listener is enabled.
SCAN Listener LISTENER_SCAN3 exists
SCAN Listener is enabled.
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