为什么Basic Auth不能与我的WCF客户端到javasoapweb服务一起工作?

我有一个基于Java的web服务,它需要基本的身份验证才能与之通信。如果我在浏览器中键入WSDL url,系统会提示我输入Basic Auth。我可以通过输入正确的凭证来获取。

但是使用我的WCF客户端不起作用。

我的WCF客户端是这样构造的:

var binding = new BasicHttpBinding
{
  MaxReceivedMessageSize = 2048 * 10240,
  Security = {
    Mode = BasicHttpSecurityMode.TransportCredentialOnly, 
    Transport = {
      ClientCredentialType = HttpClientCredentialType.Basic,
      Realm = "MYREALM",
      ProxyCredentialType = HttpProxyCredentialType.None
    }, 
    Message = {
      ClientCredentialType = BasicHttpMessageCredentialType.UserName,
      AlgorithmSuite = SecurityAlgorithmSuite.Default
    }
  }
};

var client = new WebServiceClient(binding, endpoint);
client.ClientCredentials.UserName.UserName = username;
client.ClientCredentials.UserName.Password = password;
client.DoWebServiceMethod();

我得到以下例外。

System.Net.WebException: The remote server returned an error: (401) Unauthorized.
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout) 
System.ServiceModel.Security.MessageSecurityException: The HTTP request is unauthorized with client authentication scheme 'Basic'. The authentication header received from the server was 'Basic realm="MYREALM"'.

据我所知,我做的事情是对的。我哪里出错了?