HOST=127.0.0.1
for((port=1;port<=65535;++port));do echo -en "$port ";if echo -en "open $HOST $port\nlogout\quit" | telnet 2>/dev/null | grep 'Connected to' > /dev/null;then echo -en "\n\nport $port/tcp is open\n\n";fi;done

Vérif CSR :
openssl req -in mycsr.csr -noout -text

$ mkdir -p config work logs
$ certbot certonly --config-dir config/ --work-dir work/ --logs-dir logs/ \
--server https://acme-v02.api.letsencrypt.org/directory --manual \
-d '*.monsite.fr'