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→Prerequisites: clarify connection requirements--needs port 80 inbound, and 80 and 443 outbound
* www.example.com is a valid domain name--the domain has been registered, and DNS records are published for it.
* www.example.com is a valid domain name--the domain has been registered, and DNS records are published for it.
* www.example.com resolves to your SME Server--published DNS records give the external IP address of your SME Server when queried for www.example.com.
* www.example.com resolves to your SME Server--published DNS records give the external IP address of your SME Server when queried for www.example.com.
* Your SME Server is connected to the Internet.
* Your SME Server is connected to the Internet, and is able to make outbound connections on ports 80 and 443.
* Port 80 on your SME Server is open to the Internet--you aren't behind a firewall, or some ISP filtering, that would block it.
* Port 80 on your SME Server is open to the Internet (i.e., the Internet can reach your server on port 80)--you aren't behind a firewall, or some ISP filtering, that would block it.
Letsencrypt will issue certificates that include multiple hostnames (for example, www.example.com, example.com, and mail.example.com), all of which would be part of the request. All of the conditions above must be true for all of the hostnames you want to include in the certificate.
Letsencrypt will issue certificates that include multiple hostnames (for example, www.example.com, example.com, and mail.example.com), all of which would be part of the request. All of the conditions above must be true for all of the hostnames you want to include in the certificate.
