How do I make sure the EC2 instances behind loadbalancer are not directly accessible? [closed]

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I have two EC2 instances behind a Amazon load balancer. The load balancer routes requests on port 80 to the instance port 80.

How do I make sure the instance services are accessible only through the loadbalancer DNS and not accessible directly through the instance public DNS ?

thanks Santhosh

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That should be possible via appropriately setting the security groups for the EC2 instances, so that only connections from the Load Balancer are allowed.