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The ''mod_ssl'' module adds an important feature to the Apache2 server - the ability to encrypt communications. Thus, when your browser is communicating using SSL, the https:// prefix is used at the beginning of the Uniform Resource Locator (URL) in the browser navigation bar. 

The ''mod_ssl'' module is available in ''apache2-common'' package. Execute the following command from a terminal prompt to enable the ''mod_ssl'' module:<br/><code style="background-color:lightgray">sudo a2enmod ssl</code>

There is a default HTTPS configuration file in /etc/apache2/sites-available/default-ssl. In order for Apache2 to provide HTTPS, a certificate and key file are also needed. The default HTTPS configuration will use a certificate and key generated by the ssl-cert package. They are good for testing, but the auto-generated certificate and key should be replaced by a certificate specific to the site or server. For information on generating a key and obtaining a certificate see [[https://help.ubuntu.com/12.04/serverguide/certificates-and-security.html Certificates]]