Our website down with Error 521

We are experiencing errors on all websites hosting on our server and the message is Error 521
Ray ID: 6bf1c6dfeb96053a • 2021-12-17 17:12:32 UTC

Web server is down

What is the error about.As a first step please advice the cloudflare servers so that we can whitelist to see if this willresolve the problem

The list is at cloudflare.com/ips

have whitelisted the IP Addresses but the problem still persists.

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