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In the not too distant past, only one HTTPS/SSL site was permitted per IP address. In other words, every secure web site needed its own IP.
Support for multiple HTTPS/SSL sites on one IP was added to web browsers and operating systems over the years (via Server Name Indication (SNI), but there was one very important hold out -- Windows XP. Well... Windows XP was retired, so support for SSL on virtual hosts was added in ClearOS 7. -