Aurora Serverless connectivity is handled differently from provisioned Aurora. While Aurora provisioned/RDS uses a manual certificate provisioning, which is directly installed on the database, Aurora serverless uses a fleet of proxy combined with ACM. This may explain the differences of support in TLS version.
So in summary,
- Provisioned Aurora MySQL 5.6 only supports TLS version 1.0.
- Provisioned Aurora MySQL 5.7 supports TLS version 1.0, 1.1, and 1.2.
- Aurora Serverless supports TLS version 1.0, 1.1, and 1.2.
Hope this helps.
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