💡 RDS 포트를 보안 관련 이슈로 변경하였지만, yml에 변경된 포트를 반영해주지 않았기 때문에 발생한 이슈 에러 코드 2023-05-30 06:27:29.225 ERROR 58789 --- [nio-8021-exec-1] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization. com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received a..