AWS Network Load Balancer health check failed

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Cluster information:

Kubernetes version: v1.19
Cloud being used: AWS
Host OS: Ubuntu 20.04

I tried to create a Network Loadbalancer with the propertie “externalTrafficPolicy” set to Local in order to keep the client source IP.
When this propertie is set, all the node in the target group fail the healthcheck.

I don’t understand how the healthCheckPort and path should be configured. Is it on application side ? Or it’s a health check handled by the kube-proxy ?