In this post, you will know how to change the Listener Port In Oracle RAC. We can change some listener ports from 1521 to 1525 on a RAC.
1. Check the listener status

2. Modify the listener

3. Bounce the listener

4. Change the MGMTDB listener

5. Restart the MGMTDB listener
Had to also restart the MGMTDB database before restarting the listener

If above error occured, then we need to stop MGMTDB also.

6. Scan Listener already at 1525

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