Why does Elastic Load Balancing report 'Out of Service'?

Question

I am trying to set up Elastic Load Balancing (ELB) in AWS to split the requests between multiple instances. I have created several images of my webserver based on the same AMI,

Answer 1

I had this issue too, and it was due to both my inbound and outbound rule for the Load Balancer's Security Group only allowing HTTP traffic on port 80. I needed to add another rule for HTTPS traffic on port 443.