If you have an external web service reference in your sharepoint solution, you can use web.config configuration like:

<system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
<bindings>
        <wsHttpBinding>
            <binding name="WSHttpBinding\_ISuperService" >
                <security mode="None">
                    <message clientCredentialType="None" />
                </security>
            </binding>
        </wsHttpBinding>
    </bindings>
    <client>
        <endpoint address="http://super.domain/SuperService.svc"
            binding="wsHttpBinding"
            bindingConfiguration="WSHttpBinding\_ISuperService" 
            contract="ISuperService"
            name="SuperServiceEndpoint">
        </endpoint>
    </client>
</system.serviceModel>
```security mode is set to "None". Then in code just get this configuration:

var proxy = new SuperServiceClient(“SuperServiceEndpoint”); var result = proxy.GetSomething();

var binding = new WSHttpBinding(); binding.Security.Mode = SecurityMode.None; var endpoint = new EndpointAddress(“http://super.domain/SuperService.svc"); var proxy = new ExternalServices.DreamServiceClient(binding, endpoint); var result = proxy.GetSomething();