AWS Elastic Load Balancers support HTTP, HTTPS (Secure HTTP), TCP and SSL (Secure TCP) protocols. To support HTTPS, the AWS ELB requires a CA authenticated SSL certificate. If you are using HTTPS/SSL protocol for your listeners, you might have an SSL server certificate installed on your Load Balancer. The SSL certificate has to be updated periodically. This guide shows you how to update and attach an SSL certificate to your HTTPS/SSL ELB.