curl stop working on my server - php

Question

Curl stop working on my server but it is working perfectly on the other server
Here is my script:
<?php
$proxy_ip = '165.139.149.169';
$proxy_port = '3128';
$url = 'https://www.google.com/search?q=skinny+fiber+ingredients&btnG=Search&client=ubuntu&channel=fs&num=100&ie=utf-8&oe=utf-8&gfe_rd=cr&ei=sw9CVbCuPKaA8QfX0ICYBA&gws_rd=cr';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_REFERER, 'https://www.google.com');
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:28.0) Gecko/20100101 Firefox/28.0');
curl_setopt($ch, CURLOPT_MAXREDIRS, 5); // Good leeway for redirections.
curl_setopt($ch, CURLOPT_PROXYPORT, $proxy_port);
curl_setopt($ch, CURLOPT_PROXYTYPE, 'HTTP');
curl_setopt($ch, CURLOPT_PROXY, $proxy_ip);
//curl_setopt($ch, CURLOPT_PROXYUSERPWD, $loginpassw);
$data = curl_exec($ch);
curl_close($ch);
echo "abc";
echo $data;
?>
http://serpbull.com/dev/curl.php (script not working here)
http://imarkdev.com/serp/curl.php (script working here)
Edit:
Not working script takes very long to respond (curl timeout) and prints empty response.

Answer 1

Use curl_error() function to get more information about the failure.
$data = curl_exec($ch);
if ($data === false)
{
echo 'Curl error: ' . curl_error($ch);
} else {
echo 'Response: ' . $data;
}