By default, the validity period of an SSL certificate issued by a certificate authority (CA) is one year. To extend the validity period of your SSL certificate, you must renew the certificate within 30 calendar days before the certificate expires. SSL Certificates Service allows you to manually renew an existing certificate by purchasing a certificate with the same specifications..
To renew an existing certificate that is in the Issued or Uploaded state, you can manually purchase a certificate that is exactly the same as the existing certificate within 30 calendar days before the existing certificate expires. You can purchase a certificate in the Renewal Purchase panel in the SSL Certificates Service console. The certificate that you manually purchased is the same as the existing certificate in terms of the domain name type, certificate type, certificate grade, and certificate brand. You can use the application information of the existing certificate to apply for certificate renewal from the CA.
After you obtain the renewed certificate, you must manually install it to your web server or Alibaba Cloud service to replace the existing certificate before the existing certificate expires.
Automatically add the remaining validity period of the existing certificate to the validity period of the renewed certificate