Hello, there was such a problem with my site, I see the site everything is fine, but when another person visits the site, he writes error 521 how to use it in the documentation, I did not understand how it is
May I ask you to post and share your domain name in bracketed dot [.] notation here and URL example to the particular resource with us so we could double-check, troubleshoot and provide some feedback information? 
May I ask what troubleshooting steps have you tried already from the article below related to your 521 error?
This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.