Multiple sudden 521 error

Hi, our website has had multiple failures today, with the following warning. Web server is down Error code 521
Visit for more information.
2024-05-03 12:06:22 UTC
Can you please provide an urgent explanation?
Thank you

Our website’s logs are crystal clear, talked to hetzner the hosting provider and they say there is nothing wrong with our instance

Error 521 means connections from Cloudflare to your server were rejected somewhere, see…