Am having the same issue, I have SSL on my site from Let’s Encrypt but anytime I enable Cloudflare it gives me 521 Host Error. When I pause it, everything starts to work sometimes I see the cpanel 404 page. Don’t know what to do again

A screenshot to your host? Maybe, depends what they need. You could also open a support ticket with Cloudflare and maybe they can shed some light on what is going on from their perspective. https://support.cloudflare.com/requests/new - if you open a ticket post the number here @cloonan

521 - web server down

Website, Application, Performance Getting Started

domjh May 23, 2019, 11:11am 4

Please don’t double post.

@sandro replied before, also:

1 Like

Topic		Replies	Views
[fixed] Error 521 when server is running DNS & Network dash-ssl-tls , dash-getting-started , dash-errors , dash-troubleshooting	7	24783	July 1, 2019
Hostgator + CloudFlare SSL Error Security dns , dash-ssl-tls , dash-getting-started , dash-errors , dash-troubleshooting	19	6971	February 5, 2019
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Error 521,Ray ID: 4e45e5f03ea513a5 • 2019-06-09 20:36:31 UTC Web server is down Security dash-ssl-tls , dash-errors , dash-troubleshooting	2	6668	July 10, 2019
Getting 521 just from https request DNS & Network dash-errors , dash-troubleshooting	7	4876	December 12, 2018

521 - web server down

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