Fallback SSL certificate may be required to provide secure connection for clients or devices that do not support Server Name Indication (SNI). When SNI option is enabled for a site, you may enable a fallback SSL certificate that would secure such clients or devices. This certificate should cover all host names used for sites and applications with custom host name within sites that have the SNI option enabled. It is recommended to use the Wildcard certificate or SAN certifi- cate that contains all corresponding host name entries.
To enable the Fallback certificate, click on Global Site Settings in configuration menu.
Select the checkbox: Enable Fallback SSL Certificate under Fallback SSL Certificate section,
Select the corresponding certificate from the dropdown list. If you have not installed the certificate yet, you may start the certificate console by clicking on Start Certificate MMC.
After selecting the certificate, click OK.