two SSL certificate in one site?

[asamm]

We are developing a white label solution that will launch very soon. Basically, we are targeting businesses and organisations that have a web presence. We will be providing them with a solution that can be bolted onto their existing website seamlessly.

The system should work as :
all our clients will be a subdomain of our main whitelabel
client1.whitelabel .com
client2.whitelabel .com ...

So we purchased a wildcart SSL certificate and applied that to whitelabel.com where all of these client should work, and they work fine.

But the problem is:

We have another main site that have different domain to our whitelabel.com, that also have be loaded through our white label but with its own domain oursite.com.

it works find for all other functionalities, this site can run as oursite.com but uses whitelable file system and database.

Until it comes to move to secure area e.g. login or checkout the browser gives warning because the certificate is not valid for this domain.

I am quite new to windows server and we are using plesk control panel.
Is there any way we can add a second certificate for our main site.

or any other ways, create this domain in the plesk and buy a certificate for it, will that work?

[ukwebmaster]

You will need an additional SSL for each different domain (whitelabel.com, oursite.com, xyz.com).

As you can only have one certificate per site, create a new site in IIS for each different domain (and then point to same folder/database).

At least, that's what I do...