I am trying to attach some backend instances with private IP addresses to my internet-facing load balancer in ELB

I did everything Neal Davis did in the course but my instances in the target group always wound up unhealthy.

I created 2 security group

1 for the private instances

1 for the public facing ALB

For the Public facing SG, I created a port 80 from anywhere for inbound traffic, and port 80 going to the private instances for outbound traffic.

While the private Security group only have port 80 coming from the public facing ALB as the source for the inbound

I created private subnets for the private instances, created routing table and NAT gateway.

But for some reason, the instances in the target group always end up unhealthy.

Am I missing anything???

  Author: ALLINO

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