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I am running a webserver on Ubuntu 16.04 LTS. My CMS relies for updates on a site hosted with a Cloudflare certificate. My problem is that is started recently to be not accessible anymore.

When I connect via openssl s_client I get

depth=1 C = US, ST = CA, L = San Francisco, O = "CloudFlare, Inc.", CN = CloudFlare Inc ECC CA-2 verify error:num=20:unable to get local issuer certificate

I manually installed the origin-ca certificates (ECC, RSA etc.) that are found on the Cloudflare support page - no change.

With Firefox (on windows) and openSUSE Tumbleweed and Leap 15.0 and 15.1 -> No problem site is loaded.

Could anyone help me which certificate is missing and how to install it?

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