How do you setup management interface? I didn't try myself, but you can set http and htps attributes for http-interface.
<http-interface security-realm="ManagementRealm" http-upgrade-enabled="true">
<socket-binding http="management-http" https="management-http"/>
Thank you for the reply, but unfortunately that won't work as it will cause a port conflict on starting the https listener.
I did try it just to see and ended up with errors trying to start.
I might have to use Apache httpd to handle the https on port 9993 and only run Wildfly management on 9990, using a proxypass, not an ideal solution but it should work.