If you use that DNS name in Management Studio, it should connect without errors. not in a VPC), the SSL certificate of the server has as its subject a DNS name of the form (where NNN-NNN-NNN-NNN is the public IP address of the instance and RRRRR depends on the region). If the RDS SQL instance was launched on the EC2-Classic platform (i.e. TrustServerCertificate=true is the only way to connect with SSL in this case confidentiality (encryption) is provided, but server authentication is not. If the RDS SQL instance was launched in a VPC, the SSL certificate of the server will unfortunately never pass validation, as its subject (CN) is an IP address different than the public IP assigned to the instance. The error occurs because Amazon does not set the subject name in the SSL certificate issued to the server to the DNS name shown in the RDS console.
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