Error 521 problem with the site

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? :thinking:

May I ask what troubleshooting steps have you tried already from the article below related to your 521 error? :thinking:

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