IF you are still facing the problem then do the following.
1.
$config['useragent'] = 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0';
curl_setopt($curl, CURLOPT_USERAGENT, $config['useragent']);
curl_setopt($curl, CURLOPT_REFERER, 'https://www.domain.com/');
2.
$dir = dirname(__FILE__);
$config['cookie_file'] = $dir . '/cookies/' . md5($_SERVER['REMOTE_ADDR']) . '.txt';
curl_setopt($curl, CURLOPT_COOKIEFILE, $config['cookie_file']);
curl_setopt($curl, CURLOPT_COOKIEJAR, $config['cookie_file']);
NOTE: You need a COOKIES folder in directory.
3.
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
If doing these don’t solve the problem then Give the Sample Input/Output/Error/etc.
So, that more precise solution can be provided.