**To change the default action** This example changes the default action for the specified listener. Command:: aws elbv2 modify-listener --listener-arn arn:aws:elasticloadbalancing:us-west-2:123456789012:listener/app/my-load-balancer/50dc6c495c0c9188/f2f7dc8efc522ab2 --default-actions Type=forward,TargetGroupArn=arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-new-targets/2453ed029918f21f Output:: { "Listeners": [ { "Protocol": "HTTP", "DefaultActions": [ { "TargetGroupArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-new-targets/2453ed029918f21f", "Type": "forward" } ], "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188", "Port": 80, "ListenerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:listener/app/my-load-balancer/50dc6c495c0c9188/f2f7dc8efc522ab2" } ] } **To change the server certificate** This example changes the server certificate for the specified HTTPS listener. Command:: aws elbv2 modify-listener --listener-arn arn:aws:elasticloadbalancing:us-west-2:123456789012:listener/app/my-load-balancer/50dc6c495c0c9188/0467ef3c8400ae65 --certificates CertificateArn=arn:aws:iam::123456789012:server-certificate/my-new-server-cert Output:: { "Listeners": [ { "Protocol": "HTTPS", "DefaultActions": [ { "TargetGroupArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-targets/73e2d6bc24d8a067", "Type": "forward" } ], "SslPolicy": "ELBSecurityPolicy-2015-05", "Certificates": [ { "CertificateArn": "arn:aws:iam::123456789012:server-certificate/my-new-server-cert" } ], "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188", "Port": 443, "ListenerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:listener/app/my-load-balancer/50dc6c495c0c9188/0467ef3c8400ae65" } ] }