As of DA 1.50.0, we've added a new feature that allows you to make use of LetsEncrypt, a tool offering free basic SSL certificates.
We've written the script in such a manner that you can also setup SSL for your hostname and all services in one simple command for your hostname:
eg:
cd /usr/local/directadmin/scripts
./letsencrypt.sh request_single your.server-hostname.com 4096
And Then force Directadmin to use SSL hostname:
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
which will also install the new cert/key/ca files in all respective global places for apache, dovecot, exim, ftp, and DirectAdmin.
NOTE The hostname value, eg: your.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.
DirectAdmin should be protected with SSL in 1min when the command finished.