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Hi there,
When you added your custom SSL certificate, did you also add the Cloudflare CA certificate as well?
If not, you can get it from here and re-add the certificate in your DigitalOcean acount and include the CA certificate:
https://developers.cloudflare.com/ssl/origin-configuration/origin-ca
I’ve just tested this with with the CA certificate added and it seems to be working as expected.
Let me know how it goes!
Best,
Bobby
I had the same problem and contacted support. Their reply was:
"Hello,
Thanks for getting in touch! I will be happy to help you here.
I understand that you are experiencing issues in setting up the custom SSL certificate created from Cloudflare for the CDN. We do not support the SSL certificate created from Cloudflare. So I would recommend create the SSL certificate from a different SSL Certificate Authority and let us know if you are able to successfully setup the SSL for the CDN services."
So it seems cloudflare is not supported as a Certificate Authority.