Install SSL certificate on DirectAdmin hostname using Let's Encrypt

[Andy]

Follow the tutorial down below to enhance your DirectAdmin Login Page with Let's Encrypt SSL certificate:

cd /usr/local/directadmin/scripts
./letsencrypt.sh request_single your.server-hostname.com 4096

The script above will also install the new cert/key/ca files in all respective global places for Apache, Dovecot, Exim, FTP, and DirectAdmin itself.

NOTE: The hostname value, eg: your.server-hostname.com must match the "servername" value set in the directadmin.conf, or it will not be in hostname mode, but User domain mode instead.

You must then turn on SSL in DirectAdmin and tell DirectAdmin to use the carootcert, as well as force the hostname for SSL:

cd /usr/local/directadmin
./directadmin set ssl 1
./directadmin set carootcert /usr/local/directadmin/conf/carootcert.pem
./directadmin set ssl_redirect_host your.server-hostname.net
service directadmin restart

From now on, your DirectAdmin login page will be served in https
There you have it, all done
Reference: https://help.directadmin.com/item.php?id=629