You may need to replace the certificates in the following scenarios:
The existing certificates expire.
Due to invalid private keys, an error occurs when adding a certificate to a Server Load Balancer instance. In this case, you must replace the certificate with a valid one.
Create and upload a new certificate.
Configure the new certificate in the HTTPS listener.
For more information, see Configure HTTPS listeners.
On the Certificates page, find the target certificate, and then click Delete.
Click Confirm to delete the old certificate.