Some problem with code php. Page don't remember my authorize.

I have a problem with page - pddpmr.ru/test.php This page have some code, that block page’s content. And after login/pas i must see - Hello World (page’s content), but after login i see protect form again. I test this code on other hosting and it work perfect - http://angelika-sansara.ru/test.php What could it be?

My droplet - Ubuntu 14.04 x64 with vestacp.com

Login - test Password - test

<?php
  $old_ua = @ini_set('user_agent', 'glopart-subscription-2');
  $response = @file("http://glopart.ru/subscription/phpform/103928?"
  ."&subscription_login_id=".urlencode($_COOKIE["subscription_login_id"])
  ."&subscription_token=".urlencode($_COOKIE["subscription_token"])
  ."&GRemoteAddr=".urlencode($_SERVER["REMOTE_ADDR"])
  ."&GUserAgent=".urlencode($_SERVER["HTTP_USER_AGENT"])
  ."&back=".$_SERVER["SERVER_NAME"].htmlentities(urlencode($_SERVER["REQUEST_URI"])));
  if ($response !== false) {
   if (count($response)>1 || $response[0] != 'true') {
    header('Content-Type: text/html; charset=utf-8');
    die(implode("", $response));
   }
  } else die('Не удалось запросить внешний сервер');
  @ini_set('user_agent', $old_ua);
?>

Hello world

Thanks for any help!