A fatal issue occurred during the DNS lookup process for serial-club.ru/CAA.
DNS response for serial-club.ru/CAA did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for serial-club.ru/A.
DNS response for serial-club.ru/A did not have an acceptable response code: SERVFAIL
A fatal issue occurred during the DNS lookup process for serial-club.ru/AAAA.
DNS response for serial-club.ru/AAAA did not have an acceptable response code: SERVFAIL
No valid A or AAAA records could be ultimately resolved for serial-club.ru. This means that Let's Encrypt would not be able to to connect to your domain to perform HTTP validation, since it would not know where to connect to.
No A or AAAA records found.