Is the original SSL certificate still valid after the server IP address is altered?
Should your SSL certificate be tied to a domain name, it remains unaffected by any alterations to the server's IP address. Provided the domain name associated with the certificate remains constant, it can be re-routed to a new IP address, and the original SSL certificate will continue to function as intended, negating the need for a replacement.
In the event that your SSL certificate is linked to an IP address, it will be impacted by any modifications to the server's IP. It will be necessary to apply for a new certificate, bind it to the new IP address, and deploy it to the server for it to become effective.