Looks to me that that feed is not allowing you to grab it.
463 Restricted Client: This resource is not available for access by your
  client software. This request has been blocked. Please retry your
  request from a different client.
DOSarrest Internet Security is a cloud based fully managed DDoS
  protection service. This request has been blocked by DOSarrest due to
  the above violation. If you believe you are getting blocked in error
  please contact the administrator of scripts.local to resolve this issue.
You can test this by trying to use a curl instead of file_get_contents
<?php
$ch = curl_init("http://alwatan.kuwait.tt/rss.ashx");
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_REFERER, "http://www.example.org/yay.htm");
curl_setopt($ch, CURLOPT_USERAGENT, "spider");
curl_exec($ch);
curl_close($ch);
?>
As Aziz mentioned, if you set the agent and the referred, you can get through.