#concrete5 [v7] Hide login page by ip address

login.php

<?php
namespace Application\Controller\SinglePage;

use Concrete\Core\Http\Request;
use Concrete\Core\Http\Response;
use Core;

class Login extends \Concrete\Controller\SinglePage\Login
{
    public function on_start()
    {
        $request = Request::getInstance();
        $ip = $request->getClientIp();
        if ($ip != '127.0.0.1') {
            $cnt = Core::make('\Concrete\Controller\Frontend\PageNotFound');
            $v = $cnt->getViewObject();
            $contents = $v->render();
            $response = new Response($contents, 403);
            $response->send();
            Core::shutdown();
        }
        parent::on_start();
    }
}

You can use juse $this->replace('/page_not_found'); on version 8+