Why Error 520
Sometimes it is sowing “Error 520 web server is returning an unknown error”.
It is hepping since migrate to another hosting provider. Hosting provider is saying that this is from Cloudflare, nothing is from our end.
So, what is the problem and why it is showing like this -
A 520 error occurs when the connection started on the origin web server, but that the request was not completed. The most common reason why this would occur is that either a program, cron job, or resource is taking up more resources than it should causing the server not to be able to respond to all requests properly.
Review the Quick Fix Ideas in this Community Tip for troubleshooting suggestions.