PEAR:SOAP and .NET Webservices problem

Hi all, I have a big problem trying to connect a webservice developed in .NET, the client (PHP:PEAR:SOAP and NuSOAP) both return this error code: Object reference not set to an instance of an object. Searching in Google, it's may a problem with PHP and .NET especified. I don't know if someone have this problem too and how to solve it. I'll very thanksful for some idea about this. Looking again in Google, i found this: http://support.microsoft.com/default.aspx?scid=kb;en-us;810098 I see is a know bug, but I can't install the .NET framework, becouse my client machine is Linux, but I'm not absoluty sure about this issue. My Code in the two versions: <?php require_once("SOAP/Client.php"); $client = new SOAP_Client('http://xxxxxx/wsXXXxxx/ws_xxxxx.asmx?WDSL'); $params = array(

    'pin_RUT' => "10220078",
    'strnombre' => '',
    'strpaterno' => '',
    'strmaterno' => ''

); $response = $client->call('Busca_RutTitular', $params, '','http://tempuri.org/ws_Portal_ATec/ws_Clinicas/Busca_RutTitular'); print_r($response); ?> And with NuSOAP: <?php require_once('nusoap/lib/nusoap.php'); $client = new soapclient("http://xxxxxxx/wsXXX/ws_xxxxx.asmx", true); $err = $client->getError(); if ($err) {

     echo '<h2>Constructor error</h2><pre>' . $err . '</pre>';

} $params = array(

    'pin_RUT' => "10220078",
    'strnombre' => "",
    'strpaterno' => "",
    'strmaterno' => ""

); $result = $client->call('Busca_RutTitular', $params, "", "http://tempuri.org/ws_Portal_ATec/ws_Clinicas/Busca_RutTitular"); if ($client->fault) {

     echo '<h2>Fault (This is expected)</h2><pre>'; print_r($result); echo '</pre>';

} else {

     $err = $client->getError();
     if ($err) {
          echo '<h2>Error</h2><pre>' . $err . '</pre>';
     } else {
          echo '<h2>Result</h2><pre>'; print_r($result); echo '</pre>';
     }

} echo '<h2>Request</h2><pre>' . htmlspecialchars($client->request, ENT_QUOTES) . '</pre>'; echo '<h2>Response</h2><pre>' . htmlspecialchars($client->response, ENT_QUOTES) . '</pre>'; echo '<h2>Debug</h2><pre>' . htmlspecialchars($client->debug_str, ENT_QUOTES) . '</pre>'; ?> That's all. Thanks a lot in advanced for any help, and sorry for my english.