Hi there

From the note I understand that you installed SSL cert through the EC2 but when you go to website dashboard it still shows the old expired certificate, you have Application LB not a classic LB and you don't want to change anything, just want your newly installed SSL certificate to show. Please correct me if my understanding is wrong.

If an old certificate shows up, it is likely that the browser has the site cached so you can double check that as well. Also, if you using ACM please consider running through these steps as well[1]. Please make sure your your LB and your SSL certificate are in the same region and LB is listening to HTTPS(secureHTTP)on LB port 443 and instance port 80. Also check your private, public key and certificate chain if are in correct format and all in PEM-encorded[2].

please note that the connection should be secured. Check the domain that you're accessing, and then check the domain names included in your certificate. You can view the domain name using your browser and by checking the certificate details. The domain in the URL must match at least one of the domain names included in the certificate[3].

I hope the above information is helpful.

Reference

1.https://aws.amazon.com/premiumsupport/knowledge-center/associate-acm-certificate-alb-nlb/ 2.https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-create-https-ssl-load-balancer.html 3.https://aws.amazon.com/premiumsupport/knowledge-center/acm-certificate-error-https/