AWS Listeners for Classic Load Balancer Tutorial

A listener checks for connection requests from clients, using the protocol and port that you configure, and forwards requests to one or more registered instances using the protocol and port number that you configure. Common listeners for receiving requests are port 80 (HTTP) and port 443 (HTTPS). The listeners will forward requests to your ec2 instances.

listeners configured with a protocol and a port for front-end (client to load balancer) connections, and a protocol and a port for back-end (load balancer to back-end instance) connections. If the front-end connection uses HTTP or HTTPS, then your back-end connections can use either HTTP or HTTPS.

Classic Load Balancing supporting protocols

• HTTP
• HTTPS (secure HTTP)
• TCP
• SSL (secure TCP)

Classic Load Balancing supporting ports

Back-end instances can listen on the following ports

• 1-65535

Load balancers can listen on the following ports

• [EC2-VPC] 1-65535
• [EC2-Classic] 25, 80, 443, 465, 587, 1024-65535

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