Если да, тогда вам сюда и читать внимательно https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL-certificate-rotation.html
"The current CA certificates expire on March 5, 2020. Therefore, we strongly recommend completing this change as soon as possible (and no later than February 5, 2020), to avoid disruption on the expiration date. If the change is not completed, your applications will fail to connect to your RDS DB instances using SSL/TLS after March 5, 2020."
К Динаме этот тоже относится)
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