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John Morahan's picture

Let's Encrypt without port 80

To obtain a Let's Encrypt certificate, you have to prove that you control the domain name(s) the certificate will cover. The simplest and most common way to do this involves placing a special file at a special URL on your website, which Let's Encrypt then checks by making a HTTP request to your server on port 80. Most popular ACME clients such as Certbot can easily automate this domain validation method.

Unfortunately, this doesn't work in the case where port 80 is closed.

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