How to resolve cURL Error (7): couldn't connect to host?

Question

I send an item code to a web service in xml format using cUrl(php). I get the correct response in localhost, but when do it server it shows

cURL Error (7): couldn't connect to host

And here's my code:

function xml_post($post_xml, $url) {     $user_agent = $_SERVER['HTTP_USER_AGENT'];      $ch = curl_init();    // initialize curl handle     curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);     curl_setopt($ch, CURLOPT_URL, $url);      curl_setopt($ch, CURLOPT_FAILONERROR, 1);               curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);         curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);      curl_setopt($ch, CURLOPT_TIMEOUT, 50);      curl_setopt($ch, CURLOPT_POSTFIELDS, $post_xml);      curl_setopt($ch, CURLOPT_USERAGENT, $user_agent); //  curl_setopt($ch, CURLOPT_PORT, $port);                $data = curl_exec($ch);     $curl_errno = curl_errno($ch);     $curl_error = curl_error($ch);     if ($curl_errno > 0) {             echo "cURL Error ($curl_errno): $curl_error\n";     } else {             echo "Data received\n";     }     curl_close($ch);      echo $data; } 

I send the item code to the tally and fetch the details from it. I tried using both the versions php 4+ and php5+, nothing works out Any solution.

Answer 1

CURL error code 7 (CURLE_COULDNT_CONNECT)

is very explicit ... it means Failed to connect() to host or proxy.

The following code would work on any system:

$ch = curl_init("http://google.com");    // initialize curl handle curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); $data = curl_exec($ch); print($data); 

If you can not see google page then .. your URL is wrong or you have some firewall or restriction issue.

Answer 2

“CURL ERROR 7 Failed to connect to Permission denied” error is caused, when for any reason curl request is blocked by some firewall or similar thing.

you will face this issue when ever the curl request is not with standard ports.

for example if you do curl to some URL which is on port 1234, you will face this issue where as URL with port 80 will give you results easily.

Most commonly this error has been seen on CentOS and any other OS with ‘SElinux’.

you need to either disable or change ’SElinux’ to permissive

have a look on this one

http://www.akashif.co.uk/php/curl-error-7-failed-to-connect-to-permission-denied

Hope this helps