My website facing 520 unexpected error. Please help anyone to fix it
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.
May we know what is your domain name?
Is your domain pointed to Cloudflare nameservers?
If yes, regarding the 520 error you managed to get, were the A records or at your Cloudflare dashboard?
@sdayman pointed you to a great set of Community tutorials with his reply, also you can search for similar issues regarding error 520 if you cannot figure it out.
Moreover, may I ask if you have already checked with the steps as written from below article?:
Do you already have an SSL certificate installed at your origin/host for your Website(s)
(domains and sub-domains)?
Have you got CNAME or A records for your domains pointed to your origin/host IP address at Cloudflare dashboard?
Is Cloudflare allowed to connect to your origin/host?
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