Same Problem for me, same resolution.
Line 229
ldap_login_password_and_role_manager.php:229
if ( ! $ldap_login_password_and_role_manager_ldap = ldap_connect(trim(LDAP_HOST), LDAP_PORT) ) {
ldap_login_password_and_role_manager_logger(array('message'=>'unable to connect to LDAP server in function '.__FUNCTION__.'()','priority'=>'local0.notice','tag'=>basename(__FILE__)));
return array($result,null);
}