To issue and renew let's encrypt the SSL certificate using DNS (DNS-01) challenge is a good way for servers behind firewalls and servers that cannot connect to the internet.
To achieve this way, please follow the instruction from the link
More useful certbot commands
List certificates
> certbot certificates
Remove certificate
> certbot delete --cert-name [CERT_NAME]
Renew 1 certificate
> certbot renew --cert-name [CERT_NAME] --dry-run
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