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Hi, maybe you face this issue with TLS:
If a target group is configured with HTTPS health checks, its registered targets
fail health checks if they support only TLS 1.3. These targets must support an
earlier version of TLS, such as TLS 1.2.
See https://docs.aws.amazon.com/elasticloadbalancing/latest/network/target-group-health-checks.html for all details.
Hope it helps!
Didier
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The target group is set up to exclusively listen on port 80 for HTTP traffic.