Forward traffic from NLB to ALB in https

Question

Hello, I have the following setup -> API Gateway -> (through VPC Link) NLB (internal facing) -> ALB (internal facing)-> ECS.

The NLB has a listener for the 443.  It forwards to the ALB target groups for TCP 443.

When i tired https://"NLB domain":443 in api gateway, i got "Execution failed due to configuration error: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target" error.  What am i missing here?  The listener for ALB target group doesn't allow certificate.

Any help would be appreciated.  Thank you!

Answer

Hi.

If you want to perform HTTPS communication toward NLB-ALB after SSL termination at API Gateway, you need to use ACM to configure SSL certificate and listener on NLB or ALB.

Forward traffic from NLB to ALB in https

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