Can't use self-signed SSL after adding real SSL cert

[mrjohn]

I installed a real SSL cert for one of my sites using ISPConfig 3.

I have another site that I just do testing on. I really don't want to pay for an SSL cert for a site that's just used for testing stuff. However, I need SSL to test things on occasion.

The problem is, the site with the self-signed cert (site A) is using the other site's SSL and redirecting to the SSL version of that site (site B), instead of using the self-signed cert and just issuing warnings.

How do I get the server to use Site A's self-signed cert for Site A instead of Site B's cert?