Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is: *.free-island.ru
I ran this command: sudo certbot certonly --manual --preferred-challenges dns --manual-auth-hook 'acme-dns-client' -d *.free-island.ru
It produced this output: Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for *.free-island.ru
Certbot failed to authenticate some domains (authenticator: manual). The Certificate Authority reported these problems:
Domain: free-island.ru
Type: dns
Detail: DNS problem: SERVFAIL looking up TXT for _acme-challenge.free-island.ru - the domain's nameservers may be malfunctioning
Hint: The Certificate Authority failed to verify the DNS TXT records created by the --manual-auth-hook. Ensure that this hook is functioning correctly and that it waits a sufficient duration of time for DNS propagation. Refer to "certbot --help manual" and the Certbot User Guide.
Some challenges have failed.
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.
My web server is (include version): nginx/1.18.0 (Ubuntu)
The operating system my web server runs on is (include version): Ubuntu 20.04.3 LTS
My hosting provider, if applicable, is: hoster.ru
I can login to a root shell on my machine (yes or no, or I don't know): I don't know
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 1.21.0
