Error 520 help

Hi can someone help me. I started today getting error 520. Nothing has change in my server etc
Sites are jopek-architekt.pl, panosfera.pl What can i do?

A 520 is your server not properly responding to Cloudflare. Start by checking your server logs for what’s happening with those requests.
https://support.cloudflare.com/hc/en-us/articles/200171936-Error-520-Web-server-is-returning-an-unknown-error

Thanks it was nginx problem

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