Can the original SSL certificate be effective after the server IP address is changed?

The original SSL certificate may not be effective immediately after the server IP address is changed. This is because SSL certificates are typically bound to a specific domain name and IP address combination. When you change the server's IP address, the certificate may no longer match the new configuration.

For example, if you have an SSL certificate for the domain "example.com" that is tied to the IP address "192.168.1.1," and you change the server's IP address to "192.168.1.2," the certificate may no longer be valid for the new IP address.

To ensure that your SSL certificate remains effective after changing the server's IP address, you may need to:

1. Renew or Reissue the Certificate: Contact the Certificate Authority (CA) that issued your SSL certificate and request a reissue of the certificate with the updated IP address.
2. Use a Wildcard Certificate: If you have multiple servers with different IP addresses but the same domain name, you can use a wildcard SSL certificate that covers all subdomains under the main domain.
3. Implement DNS CNAME Records: Instead of changing the IP address directly, you can use DNS CNAME records to point to the new IP address. This way, the domain name remains the same, and the SSL certificate remains valid.

In the context of cloud services, platforms like Tencent Cloud offer managed SSL certificate services that can simplify the process of updating and managing certificates when IP addresses or other configurations change.