I wanted  to consume  a  java webservice, so I wrote a WCF client to consume the service. I thought Java -.Net  interinteroperability would be easy with WCF, not so easy. 

The Java Web Service used WS-Security and required a UserNameToken passed as clear text.  The below code snippet  from Hanselman's blog will solve the problem, but there is a catch . This will work only if the endpoint address is on SSL. Ofcourse, WCF will not allow you to pass UserNameToken ( username & password) as clear text on http. It has to passed on https protocol, only then it will work . 

public void WCFMethod()
{

    WSHttpBinding myBinding = new WSHttpBinding();
    myBinding.Security.Mode 
        = SecurityMode.TransportWithMessageCredential;
    myBinding.Security.Message
    .ClientCredentialType = MessageCredentialType.UserName;
    myBinding.Security
    .Message.EstablishSecurityContext = false;

    myBinding.Security
    .Message.NegotiateServiceCredential = false;

    BindingElementCollection elements = myBinding.CreateBindingElements();
    elements
    .Find<SecurityBindingElement>().IncludeTimestamp = false;

    elements
    .Find<TextMessageEncodingBindingElement>()
    .MessageVersion = MessageVersion.Soap11;
    CustomBinding newBinding = new CustomBinding(elements);
    FooPortTypeClient svc = 
    new FooPortTypeClient(newBinding, 
    new EndpointAddress("https://javawebservice.com/service"));
}

 So, I had to go apply SSL on the webservice, to get this done. I digged more & was wondering if I could create a custom binding by getting my hands dirty. It turned out, there is already an open source custom binding, luckily I stumbled on  Yaron Naveh's  blog. He has writtern Clear Username Binding to solve the problem and is  hosted ongoogle code.  I hope this helps others like me. I used this binding get authenticated on http using WS-Security.