Active Directory authentication

Step 1: Install the Extension
 
    Download the archive from the extension site.   http://www.mediawiki.org/wiki/Extension:LDAP_Authentication
    Extract the archive to the “extensions” folder in your MediaWiki installation.
    Add a RequireOnce line to the LocalSettings.php: require_once( "$IP/extensions/LdapAuthentication/LdapAuthentication.php" );