具有通过SSL证书的PHP SOAP客户端

我正在尝试使用以下代码设置Soap客户端:

I'm trying to set up a Soap client with the following code:

<?php
$wsdl           = 'https://domain.com/?wsdl';
$endpoint       = 'https://domain.com';
$certificate    = dirname(__FILE__) . '/CertWithKey.pem';
$password       = 'pwd';

$options = array(
    'location'      => $endpoint,
    'keep_alive'    => true,
    'trace'         => true,
    'local_cert'    => $certificate,
    'passphrase'    => $password,
    'cache_wsdl'    => WSDL_CACHE_NONE
);

try {
    $soapClient = new SoapClient($wsdl, $options);
} catch(Exception $e) {
    var_dump($e);
}

为我提供了一个带有.crt认证文件的.p12密钥文件.我使用openssl将.p12文件转换为.pem文件，然后将其与.crt文件合并. CertWithKey.pem对我来说不错，文件中有两个证书块.

I was given a .p12 key-file with a .crt certification file. Using openssl I've converted the .p12-file to a .pem-file and then merged it with the .crt-file. The CertWithKey.pem looks good to me, two certificate-blocks are in the file.

无论我尝试做什么，我都会不断收到消息SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://domain.com/?wsdl' : failed to load external entity "https://domain.com/?wsdl"的异常.

No matter what I try to do, I keep getting an exception with the message SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://domain.com/?wsdl' : failed to load external entity "https://domain.com/?wsdl".

与对方通话后，他们确认有一个请求传入，但他们正在记录以下错误:ssl handshake interrupted by system [hint: stop button pressed in browser?!].

After phoning with the remote party they acknowlegde that a request is coming in but they're logging this error: ssl handshake interrupted by system [hint: stop button pressed in browser?!].

由于到目前为止我在网上找不到任何有用的信息，所以我想请你们对此事有所了解.

Since I didn't find any useful information on the net so far I figured to ask you guys for some insight on the matter.

任何建议都可以尝试?我正在运行PHP 5.3.8，并且该服务器的IP地址在远程方的防火墙中列出为白色.

Any suggestions what can be tried? I'm running PHP 5.3.8 and the server's IP-address is white listed in the firewall at the remote party.