Fatal error: Uncaught SoapFault exception: [ns1:InvalidSecurity] An error was discovered processing the <wsse:Security> header

<wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">

<wsse:UsernameToken wsu:Id="UsernameToken-1" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">

<wsse:Username>userID</wsse:Username>

<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">passwd</wsse:Password>

<wsse:Nonce EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary">ZTQ3YmJjZmM1ZTU5ODg3YQ==</wsse:Nonce>

<wsu:Created>2013-07-05T19:55:36.458Z</wsu:Created>

</wsse:UsernameToken>
</wsse:Security>

ZTQ3YmJjZmM1ZTU5ODg3YQ==

$nonce = sha1(mt_rand());

dabddf9dbd95b490ace429f7ad6b55c3418cdd58

$NASC = substr(md5(uniqid('the_password_i_am _using', true)), 0, 16);
$nonce = base64_encode($NASC);

NzJlMDQ4OTAyZWIxYWU5ZA==

string usn = "MyUsername";
        string pwd = "MyPassword";

        DateTime created = DateTime.Now.ToUniversalTime();
        var nonce = getNonce();
        string nonceToSend = Convert.ToBase64String(Encoding.UTF8.GetBytes(nonce));
        string createdStr = created.ToString("yyyy-MM-ddTHH:mm:ssZ");
        string passwordToSend = GetSHA1String(nonce + createdStr + pwd);

protected string getNonce()
    {
        string phrase = Guid.NewGuid().ToString();
        return phrase;

    }

    protected string GetSHA1String(string phrase)
    {
        SHA1CryptoServiceProvider sha1Hasher = new SHA1CryptoServiceProvider();
        byte[] hashedDataBytes = sha1Hasher.ComputeHash(Encoding.UTF8.GetBytes(phrase));
        string test = Convert.ToString(hashedDataBytes);
        return Convert.ToBase64String(hashedDataBytes);
    }

The nonce is 16 bytes long and is passed along as a base64 encoded value.

$prefix = gethostname();
    $nonce = base64_encode( substr( md5( uniqid( $prefix.'_', true)), 0, 16));