All my domains are down with error 521.
They say it is the host’s problem, but the host has no problem.

How can I go about solving that? ex:

On the same origin host / server, or?
Maybe some maintenance at the hosting provider or network?

Please follow the steps in this post to solve your problem:

The site is working for me, at least for now as testing:

Before moving to Cloudflare, was your Website working over HTTPS connection?

May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )? loaded…

Perhaps, a temporary issue with your Web host?

Uptrends shows a bunch of 500 errors at Uptrends. Sitemeer and FastOrSlow show no problems.

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