Forcing SSL on multisite parent and all subdomains

hi. i have a multisite website that allows users to register. when they do, they create a subdomain like this:, i have a wildcard ssl installed but need help.

for single site installations, I normally use a force ssl plugin, make an entry in the .htaccess and then change the urls (where the installation and website is) in wp admin area to reflect HTTPS.

how do I set up the ssl so that when users dynamically create a new subdomain, the new subdomain created as normal, but is also covered by the ssl? I;ve never done this with a WPMU before so I'm hoping to learn what I don't know so I don't screw anything up. Not wanting to have to recreate any part of the site :slight_smile:.