Error 552 while trying to access HTTPS website

Website, Application, Performance Security
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I have the domain www.param.me which is hosted by GitHub pages and is accessible through HTTPS. But api.param.me is hosted from my personal server which doesn’t have a valid SSL certificate. In an attempt to make api.param.me accessible through HTTPS, I changed the domain’s nameservers to Cloudflare, made sure api.param.me is set to :orange:, and enabled full SSL. But https://api.param.me still times out

Does my server need an SSL certificate as well? Are there any other alternatives?

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This is likely due to your SSL setting (in the SSL/TLS app). This should explain what they mean (also the help text):

https://support.cloudflare.com/hc/en-us/articles/200170416-End-to-end-encryption-with-Cloudflare-Part-3-SSL-options

And why we would not recommend the insecure Flexible SSL: Why flexible SSL mode is not the best choice

Can you try setting up SSL/port 443 on your personal server? You can get a free SSL certificate from LetsEncrypt or you can download an “origin certificate” (only valid between Cloudflare and your server):

https://support.cloudflare.com/hc/en-us/articles/115000479507-Managing-Cloudflare-Origin-CA-certificates

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