php-curl doesn't connect to remote host and header appear to be empty -

i configured 1 of server accept files via post, convert them , send them response. php server uses functionality via curl.

the important part in php script looks this

$ch = curl_init();  curl_setopt($ch, curlopt_url, $url); curl_setopt($ch, curlopt_port, $port); curl_setopt($ch, curlopt_post, true); curl_setopt($ch, curlopt_returntransfer, true); curl_setopt($ch, curlopt_postfields, array('file_contents' => '@' . $filename)); curl_setopt($ch, curlopt_connecttimeout, 5); curl_setopt($ch, curlinfo_header_out, true);  file_put_contents($filename . '.png', curl_exec($ch));  print_r(curl_getinfo($ch)); echo curl_errno($ch);  curl_close($ch); 

however appears if curl doesn't connect other server , curl_getinfo returns

array (     [url] => (redacted)     [content_type] =>      [http_code] => 0     [header_size] => 0     [request_size] => 0     [filetime] => -1     [ssl_verify_result] => 0     [redirect_count] => 0     [total_time] => 0     [namelookup_time] => 0.036982     [connect_time] => 0     [pretransfer_time] => 0     [size_upload] => 0     [size_download] => 0     [speed_download] => 0     [speed_upload] => 0     [download_content_length] => -1     [upload_content_length] => -1     [starttransfer_time] => 0     [redirect_time] => 0     [redirect_url] =>      [primary_ip] => (redacted)     [certinfo] => array         (         ) ) 

curl_errno returns 28 (curle_operation_timedout) if increase timeout. said before seems doesn't establish connection remote host. it's possible connect given url using web browser.