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Since OpenBSD 5.9, the base system comes with acme-client: an open source implementation in C that requests a free HTTPS certificate from the Let’s Encrypt Certificate Authority. It is super simple to setup and even easier to use. And once your certificate is issued, the acme-renew script will ensure your website stays TLS encrypted for the remainder of its lifetime.
The following guide assumes OpenBSD 6.2, please refer to the relevant man pages for future releases.
Open the file /etc/acme-client …