I have recently been invited to the letsencrypt SSL beta, and have now spotted a potential problem.
My main site tomjn.com is a multisite, and I have the opportunity to add certificates for tomjn.com and www.tomjn.com, but I also have other subdomains, subdomains i do not have SSL certificates for.
Is it possible to have tomjn.com served over SSL via WordPress, but only tomjn.com? Or must I force all the blogs/sites in my install to use SSL? If so, how is this best done?