Error 520: Web server is returning an unknown error

#1

Good day!
09.10.2018 at 13.00-15.00 (UTC +03: 00) when trying to access the effor.by domain, users received an error 520 (Error 520: Web server is returning an unknown error), although the web server was accessible directly.
It was the first time that error appeared. What can it be connected with?
Thanks in advance for the answer.

#2

There are many threads on 520 errors. It’s most likely something at your host’s end.

https://community.cloudflare.com/search?q=520

closed #3

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