Failing to call WCF Service - wcf

Question

I have a WCF Service being hosted on IIS 5.1 with Anonymous access disabled. Below is a part of the web.config file showing how the service is configured:
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="basicHttpBindingCfg">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Windows" />
</security>
</binding>
</basicHttpBinding>
</bindings>
<services>
<service behaviorConfiguration="ServiceBehavior" name="HelloService">
<endpoint name="BasicHttpEndpoint"
address=""
binding="basicHttpBinding"
bindingConfiguration="basicHttpBindingCfg"
contract="IHelloService">
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="ServiceBehavior">
<serviceMetadata httpGetEnabled="true"/>
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
Every time I call any operations that this service exposes from a desktop application, I receive the following error message:
Either a required impersonation level was not provided, or the
provided impersonation level is invalid.
Please note that binding type and hosting environment is pre-determined by the client and cannot be changed.
Any help that may lead to resolving this issue would be greatly appreciated.
Thanks!
Zen
EDIT: Here is how the client is configured:
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpEndpoint" closeTimeout="00:01:00" openTimeout="00:01:00"
receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false"
bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
useDefaultWebProxy="true">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Windows" proxyCredentialType="None"
realm="" />
<message clientCredentialType="UserName" algorithmSuite="Default" />
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint name="BasicHttpEndpoint"
address="http://vm00000033871b.intra.pri/WCFServiceBasicHttp/HelloService.svc"
binding="basicHttpBinding"
bindingConfiguration="BasicHttpEndpoint"
contract="Proxy.IHelloService" />
</client>
</system.serviceModel>

Answer 1

Try this to pass the current users Windows credentials:
Using proxy As New PRX.HelloServiceClient()
proxy.ClientCredentials.Windows.AllowedImpersonationLevel =
TokenImpersonationLevel.Impersonation
proxy.ChannelFactory.Credentials.Windows.ClientCredential =
CredentialCache.DefaultNetworkCredentials
Dim message As String = proxy.Hello("Hi")
MessageBox.Show(message)
End Using