Something get wrong with my https/ssl connection

I have a website https://sitemate.ru which was correctly working several years with certificate let’s encrypt installed from Cloudflare panel (flexible mode).
Few days ago it becomes unaccessible (unsupported protocol).
Can someone helps me how to resolve this problem?

You currently have a security issue.

I’d suggest you first fix the security issue on your server and only then check out any possible Cloudflare issues.

For that, you best pause Cloudflare for now (Overview screen, bottom right), fix the server, and once your site loads fine on HTTPS, you can unpause Cloudflare.

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