diff --git a/config/example-config.php b/config/example-config.php
index 4948be68..b731e2a0 100644
--- a/config/example-config.php
+++ b/config/example-config.php
@@ -171,9 +171,9 @@ $c->admin_email ='calendar-admin@example.com';
 //    'port' => '389', //port
 //    'bindDN'=> 'cn=manager,cn=internal,dc=tennaxia,dc=net', //DN to bind to this server enabling to perform request
 //    'passDN'=> 'xxxxxxxx', //Password of the previous bindDN to bind to this server enabling to perform request
+//    'protocolVersion' => '3',  //Version of LDAP protocol to use
 //    'baseDNUsers'=> 'dc=tennaxia,dc=net', //where to look at valid user
-//    'filterUsers' => 'objectClass=kolabInetOrgPerson', //filter that must validate an valid user syntax according : 
-//http://www.faqs.org/rfcs/rfc4515.html , that's mean surroundeed by ( and )
+//    'filterUsers' => 'objectClass=kolabInetOrgPerson', //filter which must validate a user according to RFC4515, i.e. surrounded by brackets
 //    'baseDNGroups' => 'ou=divisions,dc=tennaxia,dc=net', //not used ATM
 //    'filterGroups' => 'objectClass=groupOfUniqueNames', //not used ATM
        /** /!\ "username" should be set and "updated" must be set **/
diff --git a/inc/drivers_ldap.php b/inc/drivers_ldap.php
index dd186c20..65b9ee30 100644
--- a/inc/drivers_ldap.php
+++ b/inc/drivers_ldap.php
@@ -56,6 +56,10 @@ class ldapDrivers
           $this->valid=false;
           return ;
       }
+
+      //Set LDAP protocol version
+      if (isset($config['protocolVersion'])) ldap_set_option($this->connect,LDAP_OPT_PROTOCOL_VERSION, $config['protocolVersion']);
+
       //connect as root
       if (!ldap_bind($this->connect,$config['bindDN'],$config['passDN'])){
           $c->messages[] = sprintf(i18n( "drivers_ldap : Unable to bind to LDAP, check your bindDN >%s< and passDN >%s< of your configuration or if your server is reachable"),$config['bindDN'],$config['passDN'] );
@@ -70,10 +74,10 @@ class ldapDrivers
       $this->baseDNGroups = $config['baseDNGroups'];
       $this->filterGroups = $config['filterGroups'];
   }
+
   /**
   * Retrieve all users from the LDAP directory
   */
-
   function getAllUsers($attributs){
     global $c;
     $entry = ldap_list($this->connect,$this->baseDNUsers,$this->filterUsers,$attributs);