FlyingCDN is unable to establish a secure connection with your origin server. This usually happens when your server lacks a valid SSL certificate or the certificate is misconfigured.
How to fix it:
Install a valid SSL certificate on your server
You can use a free certificate from Let’s Encrypt
Ensure the certificate is correctly configured and not expired
Avoid using Cloudflare Flexible SSL, as it does not encrypt the connection between Cloudflare and your server
Note: Self-signed certificates are not accepted. A valid certificate from a trusted Certificate Authority (CA) is required.