Setting up DA with an SSL certificate

user warning: Unknown column 'u.signature_format' in 'field list' query: SELECT c.cid as cid, c.pid, c.nid, c.subject, c.comment, c.format, c.timestamp, c.name, c.mail, c.homepage, u.uid, u.name AS registered_name, u.signature, u.signature_format, u.picture, u.data, c.thread, c.status FROM comments c INNER JOIN users u ON c.uid = u.uid WHERE c.nid = 13 AND c.status = 0 ORDER BY c.thread DESC LIMIT 0, 30 in /home/cmsdd/domains/cmsdd.com/public_html/modules/comment/comment.module on line 992.

You can switch DirectAdmin to use SSL instead of plain text. -> https instead of http.

If you do not have your own certificates, you'll need to create your own:
#/usr/bin/openssl req -x509 -newkey rsa:1024 -keyout /usr/local/directadmin/conf/cakey.pem -out /usr/local/directadmin/conf/cacert.pem -days 9999 -nodes

#chown diradmin:diradmin /usr/local/directadmin/conf/cakey.pem
#chmod 400 /usr/local/directadmin/conf/cakey.pem

Edit the /usr/local/directadmin/conf/directadmin.conf and set SSL=1 (default is 0). This tells DA to load the certificate and key and to use an SSL connection. DirectAdmin needs to be restarted after this change.

Refer Link : http://help.directadmin.com/item.php?id=15