What are considered as "trusted CA"?

I have a Wordpress server hosted on AWS EC2 and accessed through Elastic Load Balancer. The ELB is using AWS ACM authorized certificate.

However, when I select the “Your SSL/TLS encryption mode” on my Cloudflare dashboard, I can only select “Full”. If I select “Full (strict)”, I get Error 526 Invalid SSL Certificate when visiting my website.

I am confused by the description of “Full (strict)” mode “Encrypts end-to-end, but requires a trusted CA or Cloudflare Origin CA certificate on the server”. Is AWS AMC authorized CA not considered trusted CA in Cloudflare?

What exactly does “trusted CA” mean here?


:wave: @devops31,

Generally it refers to CAs trusted by the major browsers. Full details are here I believe:

— OG

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