certbot certonly --standalone -d lktest.qr.orgp.spb.ru --dry-run --debug-challenges -v --preferred-challenges http
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator standalone, Installer None
Simulating a certificate request for lktest.qr.orgp.spb.ru
An unexpected error occurred:
requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))
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.