[wp-hackers] WordPress multisite, Domain mapping and SSL

[John Blackbourn]

On 30 August 2011 21:57, Jeremy Felt <jeremy.felt at gmail.com> wrote:
> James,
>
> Each SSL certificate *requires* a unique IP address on the server. This is
> outside the realm of WordPress configuration. The solution will depend on
> your network and server setup.

And if you're wondering why this is it's because an SSL connection is
negotiated before the request is read, so the server cannot know the
hostname being requested until the SSL connection is made. Therefore
you can only have one SSL virtualhost per IP address.