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CURL working from localhost but not on live site


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I have a CURL code that fetches some XML content from a remote server. I get the expected output on my localhost (XAMPP on windows). But from the live site(hosted on Linux), I get the CURL error:'couldn't connect to host'.


	function DownloadUrl($Url, $p){

	// is curl installed?
	if (!function_exists('curl_init')){ 
		die('CURL is not installed!');

       // create curl resource
        $ch = curl_init();

        // set url
        curl_setopt($ch, CURLOPT_URL, $Url);

   curl_setopt ($ch, CURLOPT_POSTFIELDS, $p);
   curl_setopt ($ch, CURLOPT_POST, 1);
        //return the transfer as a string
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        // $output contains the output string
        $output = curl_exec($ch);
   if($output === false)
	   echo 'Curl error: ' . curl_error($ch);
    		print $output;
        // close curl resource to free up system resources

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