ISPConfig only supports one SSL website per IP, this is is an apache limit and not an limit of ISPConfig.
To create an SSL website, check the SSL checkbox in the website settings of the site and then create an SSL certificate on the SSL TAB. ISPConfig rewrites the vhost configuration for you to enable SSL for this website.
If you need an other setup that does not use SSL virtual hosts, you can not use ISPConfig to configure it.
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