I recently ran into this on the same issue. For us, the problem was using the SSL protocol. We needed to force TLS 1.1, and it all started to buzz. The key working component for us here is crypto_method.
$wsdl = 'PATH/TO/WSDL';
$url = 'http://URL_TO_SOAP_SERVICE';
$cert = 'PATH/TO/CLIENT/CERT';
$context = stream_context_create([
'ssl' => [
'crypto_method' => STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT,
'verify_peer' => true,
'verify_peer_name' => true,
'allow_self_signed' => false,
'cafile' => '/path/to/cafile.selfsigned'
]
]);
$params = [
'location' => $url,
'local_cert' => $cert,
'trace' => true,
'exceptions' => true,
'verifypeer' => true,
'verifyhost' => true,
'allow_self_signed' => false,
'connection_timeout' => 180,
'keep_alive' => false,
'stream_context' => $context
];
$client = new SoapClient($wsdl, $params);
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