I have an SSL Error from Submitting a SOAP request with PHP

I am getting the following response from a SOAP call to a server...

HTTP/1.1 200 OK
Date: Sun, 01 Mar 2009 01:37:46 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
Cache-Control: private, max-age=0
Content-Type: application/soap+xml; charset=utf-8
Content-Length: 712

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<getProductResponse xmlns="http://domain.com/">
<getProductResult>
<Error xmlns="">Error trying to get data from the store. Technical description: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.</Error>
</getProductResult>
</getProductResponse>
</soap:Body>
</soap:Envelope>

How can i fix this... I have a certificate on my site, and i tried running the script in https... no dice.. below is my php code...

<?php 
 
// THE XML STRING, WITH PLACEHOLDERS FOR PHP VARIABLES
$xml = '<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <getProduct xmlns="http://domain.com/">
    <storeUrl>www.domain.com</storeUrl> 
	<userKey>thekey</userKey> 
      <batchSize>1</batchSize>
      <startNum>1</startNum>
    </getProduct>
  </soap12:Body>
</soap12:Envelope>
';
 
// SETTING THE SOCKET COMMUNICATIONS INFORMATION
$method   = 'POST';
$uri      = '/service.asmx';
$protocol = 'HTTP/1.1';
$service  = 'www.theapi.com';
$c_type   = 'Content-Type: application/soap+xml; charset=utf-8';
$length   = strlen($xml);
 
 
			
			
// CREATE MESSAGE HEADERS FOR THE WEB SERVICE
$header .= "$method $uri $protocol\r\n";
$header .= "Host: $service\r\n";
$header .= "$c_type\r\n";
$header .= "Content-Length: " . $length . "\r\n\r\n";
 
// OPEN THE SOCKET
$fp = fsockopen ($service, 80, $errno, $errstr, 30);
 
// TEST FOR VERIFICATION
if (!$fp) // HTTP ERROR
{
        die("fsockopen() FAILED \n\n ERRNO=$errno \n\n ERRSTR=$errstr \n\n");
}
 
// WITH HTTP OPEN - WRITE HEADER AND REQUEST
fputs ($fp, $header . $xml);
 
// HTTP OPEN - READ WEBSERVICE RESPONSE, INCLUDING HEADERS AND BODY
$reply  = '';
while (!feof($fp))
{
        $reply  .= fgets ($fp, 1024);
}
 
// SEE THE REPLY
var_dump($reply);

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