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Bring your own client certificate for backend mTLS in Amazon API Gateway

calendar_today September 8, 2026 person Biswanath Mukherjee domain amazon-ec2

Enterprises that use Amazon API Gateway often want to bring their own client certificate for backend mutual TLS (mTLS) authentication. With API Gateway, you can now use a third-party or AWS Private CA-issued client certificate for the outbound mTLS handshake. In this post, you build a REST API with an outbound mTLS connection to an Amazon ECS backend.

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