What is SNI support?
SNI (Server Name Indication) support allows you to host multiple SSL certificates for different domains on the same IP add ress. At the start of the "handshake" process, SNI indicates the hostname to which the client connects. Users who are on shared servers that support SNI can install their own certificates without a dedicated IP address.
In order to experience the full benefit of SNI, your server must run an operating system that supports this functionality, such as CentOS 6.