This error means that no SSL is installed due to Port 443 not being open. To fix this error, ensure Port 443 is open and re-apply the SSL certificate.
I received a Cloudflare Error 521 Print
Modified on: Tue, 24 Aug, 2021 at 9:26 AM
Did you find it helpful? Yes No
Send feedbackSorry we couldn't be helpful. Help us improve this article with your feedback.