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share your email address with the Electronic Frontier Foundation, a founding
partner of the Let's Encrypt project and the non-profit organization that
develops Certbot? We'd like to send you email about our work encrypting the web,
EFF news, campaigns, and ways to support digital freedom.
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Requesting a certificate for mysite22.ru and www.mysite22.ru
Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
Domain: mysite22.ru
Type: dns
Detail: DNS problem: NXDOMAIN looking up A for mysite22.ru - check that a DNS record exists for this domain
Domain: www.mysite22.ru
Type: dns
Detail: DNS problem: NXDOMAIN looking up A for www.mysite22.ru - check that a DNS record exists for this domain
Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.
How are you able to use that domain name, if it isn't actually registered?
As said, as a publicly trusted Certificate Authority, Let's Encrypt can only issue certificates for publicly accessible domain names, which means the domain needs to be registered properly and needs to be accessible by the public domain name system (DNS).