FTP_USER Fails "Security fix for save status via Ajax" introduced in 1.8.8 about wp-maintenance-mode HOT 1 CLOSED

public function save_active() {
        public function save_config() {

            //check_ajax_referer( 'wm_config-update', 'wp-maintenance-mode-nonce' );
            $nonce = $_POST['nonce'];
            if ( ! wp_verify_nonce( $nonce, 'wp-maintenance-mode-nonce' ) )
                wp_die( __( 'You are not authorised to perform this operation.' ) );

            if ( ! current_user_can( 'manage_options' ) )
                wp_die( __( 'You are not authorised to perform this operation.' ) );

/**
 * Upgrade constants (SSH connection information for 'automatic' updates/installs)
 */
define('FS_METHOD', 'ssh2');
define('FTP_PUBKEY','/home/user/.ssh/wordpress/id_rsa.pub');
define('FTP_PRIKEY','/home/user/.ssh/wordpress/id_rsa');
define('FTP_USER','user');
define('FTP_HOST','subdomain.domain.tld:port');