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LetsEncrypt needs port 80 open to the outside so that it can verify/renew certificates. I don't have port 80 open on the mail server though.
by ProxCoques 10y ago
LetsEncrypt needs port 80 open to the outside so that it can verify/renew certificates. I don't have port 80 open on the mail server though.
- Whitestrake 10y agoLetsEncrypt actually has multiple options available for validation. Only one challenge type, http-01, requires port 80 to be open. Another, tls-sni-01, requires port 443. dns-01 requires configuration of your DNS provider. I personally make use of tls-sni-01 and dns-01 in different situations.