Problems with APNS (push notifications feedback)

Hello here,

I am having issues to connect to 'feedback.push.apple.com:2196' for feedback push notifications. My PHP script has been working perfectly until I have renewed the push notification .pem certificate, but now it gives me this error:

PHP Warning:  stream_socket_client(): Failed to enable crypto in myscript.php on line 10

Fact is: the new certificate works because I am able to send out push notifications to my app users, so, where is the problem??!!

Here is the PHP script I am using to connect to the service ( I left out the part working on the returned data which is irrilevant for the connection issue):

$passphrase = 'mypw';

$stream_context = stream_context_create();

stream_context_set_option($stream_context, 'ssl', 'local_cert', '/path/to/mycertificate.pem');

stream_context_set_option($stream_context, 'ssl', 'passphrase', $passphrase);


$apns = stream_socket_client('ssl://feedback.push.apple.com:2196', $errcode, $errstr, 60, STREAM_CLIENT_CONNECT, $stream_context);
    if(!$apns) {
        echo "ERROR $errcode: $errstr\n";
        return;
    }

///Read data here...


fclose($apns);

Any ideas are very welcome!

Thanks to everyone in advance.

Fab.