The SSL renewal requires the purchase of a brand new certificate for your domain and company. To meet the rigorous industry standards, Certificate Authorities must code the expiration date into the certificate. That’s why when an SSL cert expires, it’s no longer valid and needs replacement. It’s impossible to extend the life of an SSL certificate beyond the timeframe set by the CA/Browser Forum. The current SSL validity period is set to one year. So, when you renew your certificate, you actually buy a new one and install it again on your server.