Why doesn't an SSL certificate take effect after installation?

The most common reason why an SSL certificate does not take effect after deployment is incorrect deployment location:

• The certificate must be installed on the nodes that actually provide external services.
• If your service front end is connected to CDN, WAF, load balancer or other front-end proxy devices, replacing the certificate only on the origin server will not take effect.
• You must synchronously update and configure the SSL certificate on the CDN / WAF / load balancer front-end nodes for it to truly take effect.

Troubleshooting suggestions: Confirm whether there is a CDN or proxy layer at the front end → Check whether the certificate configuration of each layer has been updated → Refresh the CDN cache or wait for it to take effect.