Wordpress Multisite SSL issues with Domain Mapper

I am running an wordpress (subdomain) multisite installation. I need to enable ssl for a few subdomain on my installation. We are using the domain mapper to map domains to subdomains. SO..
(https://www.<clientname>.com) mapped to (<clientname>.<mydomain>.com)

So everything works fine on http, but when I try to access the site https I get a 302 redirect back to (http://www.<clientname>.com).

What is causing this? and do i need an additional plugin?