Apache Reference: mod_ssl, SSLEngine

SSLEngine

SSL Engine Operation Switch
Syntax: SSLEngine on|off
Example: SSLEngine on
Since: Apache 1.3

This directive toggles the usage of the SSL/TLS protocol engine. It is typically employed inside a <VirtualHost> section to enable SSL/TLS for a particular virtual host. By default, the SSL/TLS protocol engine is disabled for both the main server and all configured virtual hosts.