emulating form post via php backend. what is wrong with new environment?

hi there,
i have the following document C on Server C, to capture the data and send off to document A on Server A via a post request, as well as document B on Server B. the do_post_request is without curl, and is shared here: HTTP POST from PHP, without cURL

<?php
// required functions
function do_post_request($url, $data, $optional_headers = null) {
	$params = array('http' => array(
			'method' => 'post',
			'content' => $data
		)
	);
	if ($optional_headers!== null) {
		$params['http']['header'] = $optional_headers;
	}
	$ctx = stream_context_create($params);
	$fp = @fopen($url, 'rb', false, $ctx);
	if (!$fp) {
		throw new Exception("Problem with $url, $php_errormsg");
	}
	$response = @stream_get_contents($fp);
	if ($response === false) {
		throw new Exception("Problem reading data from $url, $php_errormsg");
	}
	return $response;
}
// emulate form submissions to leads 360 and intellisource
$url = "http://www.intellisource.co.za/999_andycabenquiries.php";		// intellisource request
$data = "name=".$_POST["name"].											// First Name
		"&surname=".$_POST["surname"].									// Last Name
		"&email=".$_POST["email"].										// Email
		"&textfield32=".$_POST["textfield32"].							// Phone
		"&cellphone=".$_POST["cellphone"].								// Cellphone
		"&message=".$_POST["message"];									// Message
$ret = do_post_request($url,$data);										// post intellisource request id
echo $ret;																// print intellisource return value
$url  = "https://secure.leads360.com/Import.aspx?Provider=Vertical".	// leads 360 url
		"Masters-Other&Client=LMX-9014&CampaignId=7075";
$data = "Ref Id= ".														// Lead Provider ID
		"&First Name=".$_POST["name"].									// First Name
		"&Last Name=".$_POST["surname"].								// Last Name
		"&Email=".$_POST["email"].										// Email
		"&Home Phone=".$_POST["textfield32"].							// Home Phone
		"&Work Phone=".$_POST["textfield32"].							// Work Phone
		"&Mobile Phone=".$_POST["cellphone"].							// Mobile Phone
		"&Message=".$_POST["message"].									// Message
		"&AndyCab ID=".$ret;											// add andycab id retrieved from intellisource
$ret = do_post_request($url,$data);										// post leads 360 request
echo $ret;																// print leads 360 return value
?>

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now with the current configuration of server A, this code works posting to both server A and server B when testing from server A - but with the unknown configuration of server C, i need to figure out why i am getting the following exception and if there is a way to get any more details when running. the response on server C:

<br />
<b>Fatal error</b>:  Uncaught exception 'Exception' with message 'Problem with http://www.intellisource.co.za/999_andycabenquiries.php, ' in /usr/www/users/andyca/intellisourceleads360.php:15
Stack trace:
#0 /usr/www/users/andyca/intellisourceleads360.php(35): do_post_request('http://www.inte...', 'name=Pierre&amp;sur...')
#1 /usr/www/users/andyca/form.php(5): include_once('/usr/www/users/...')
#2 {main}
  thrown in <b>/usr/www/users/andyca/intellisourceleads360.php</b> on line <b>15</b><br />

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the A server is www.intellisource.co.za which is on an Apache 2.2.19 machine.
the B server is www.leads360.co.za which seems to be on an IIS machine.
the C server is www.andycab.co.za which is on an Apache 2.2.9 machine.
server A posts to server B and itsself, but server C does not post to either it seems.
document A which captures the data, and inserts into a database table, is the following:

<?php
$GLOBALS["sql"] = array();
$conn = mysql_connect("localhost", "dwtphovu_f3rr37y", "JapieMySkapie101");
if (!$conn) {
	$err = "ERROR #".mysql_errno()."Could not connect: ".mysql_error()." in ".$doc." on Line ".$line;
	array_push($GLOBALS["sql"],$err);
}
mysql_select_db("dwtphovu_8347379386_prod", $conn);
function mysql_query_errors($sql, $conn, $doc, $line, $expret = false) {
	$line--;
	$err = "";
	$result = mysql_query($sql);
	if (mysql_errno() > 0) {
		$err = "ERROR #".mysql_errno().": ".mysql_error()." in ".$doc." on Line ".$line;
	} elseif ($expret) {
		if (is_null($result)) {
			$err = "NOTICE #0504: A null value was returned by the query defined in ".$doc." on line ".$line--;
		} elseif ($result === false) {
			$err = "NOTICE #0502: A false value was returned by the query defined in ".$doc." on line ".$line--;
		} elseif ($result === true) {
			$err = "NOTICE #0501: A true value was returned by the query defined in ".$doc." on line ".$line--;
		} elseif (mysql_num_rows($result) < 1) {
			$err = "NOTICE #0500: An empty result set was returned by the query defined in ".$doc." on line ".$line--;
		}
		array_push($GLOBALS["sql"],$sql."\n",$err."\n");
	}
	return $result;
}
/* **************************************************************************************************
function str_in_array($haystack, $needle, $sw = 1) {
    foreach ($haystack as $value[0] => $value[1]) {
        if (stristr($value[$sw],$needle)!==FALSE) {
            return true;
        }
    }
    return false;
}
// get table fields to compare with form
$existing = array();
$tsql = "SHOW COLUMNS FROM dwtphovu_8347379386_prod.999_andycabenquiries;";
$result = mysql_query_errors($tsql, $conn, __FILE__, __LINE__);
if ($result) {
	while ($row = mysql_fetch_assoc($result)) {
		if ($row["Field"] != "bigint_EnquiryID") {
			array_push($existing,$row["Field"]);
		}
	}
}
echo "\$existing = ".print_r($existing,true)."<br>";
// alter table to add new fields if found
$tocreate = array();
foreach ($_POST as $key=>$value) {
	if ($key != "Reset" &&
		$key != "Submit2" &&
		!str_in_array($existing,$key)) {
		array_push($tocreate,ucfirst($key));
	}
}
echo "\$tocreate = ".print_r($tocreate,true)."<br>";
foreach ($tocreate as $key=>$value) {
	$asql = "ALTER TABLE 
				dwtphovu_8347379386_prod.999_andycabenquiries 
			 ADD 
				`text_Enquiry".$value."` 
				TEXT CHARACTER SET utf8 
				COLLATE utf8_unicode_ci 
				NULL 
				DEFAULT NULL 
				COMMENT 'Enquiry ".$value."',
			  ADD FULLTEXT 'FULLTEXT' (
				`text_Enquiry".$value."`
			 )";
	$result = mysql_query_errors($asql, $conn, __FILE__, __LINE__);
}
echo print_r($GLOBALS["sql"],true);
************************************************************************************************** */
// insert new record
$tsql = "INSERT INTO 
			 dwtphovu_8347379386_prod.999_andycabenquiries 
		 (
			 text_EnquiryName, 
			 text_EnquirySurname, 
			 text_EnquiryEmail, 
			 text_EnquiryPhone, 
			 text_EnquiryCellPhone, 
			 text_EnquiryMessage
		 ) VALUES (
			\"".mysql_real_escape_string($_POST["name"])."\", 
			\"".mysql_real_escape_string($_POST["surname"])."\", 
			\"".mysql_real_escape_string($_POST["email"])."\", 
			\"".mysql_real_escape_string($_POST["textfield32"])."\", 
			\"".mysql_real_escape_string($_POST["cellphone"])."\", 
			\"".mysql_real_escape_string($_POST["message"])."\"
		 );";
$result = mysql_query_errors($tsql, $conn, __FILE__, __LINE__);
echo (count($GLOBALS["sql"]))?implode("\n",$GLOBALS["sql"]):mysql_insert_id($conn);

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document B is a third party lead manager.