ASP.NET网站 – > WCF服务 – > WCF服务,一路冒充？

>用户在Web浏览器中触发操作,这会导致对Web服务器(服务器A)中的Web服务进行Ajax调用.
> Web服务器发出对IIS(服务器B)中托管的WCF服务的调用
> WCF服务发出对IIS(服务器C)中托管的另一个WCF服务的调用

所有网站都通过http而不是https公开.

现在,服务器C需要知道用户在另一端的用户.到目前为止,我已将其工作,以便在模拟下执行对服务器B的WCF服务调用,因此服务器B具有表示用户的WindowsIdentity对象.但是,当我尝试在模拟下调用从服务器B到服务器C的服务调用时,我得到以下内容：

System.ComponentModel.Win32Exception: No credentials are available in the security package

Server stack trace: 
   at System.IdentityModel.SspiWrapper.AcquireCredentialsHandle(String package,CredentialUse intent,AuthIdentityEx& authdata)
   at System.ServiceModel.Security.SecurityUtils.GetCredentialsHandle(String package,NetworkCredential credential,Boolean isServer,String[] additionalPackages)
   at System.ServiceModel.Security.SpnegoTokenProvider.OnOpening()
   at System.ServiceModel.Security.WrapperSecurityCommunicationObject.OnOpening()
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Security.CommunicationObjectSecurityTokenProvider.Open(TimeSpan timeout)
   at System.ServiceModel.Security.SecurityUtils.OpenTokenProviderIfRequired(SecurityTokenProvider tokenProvider,TimeSpan timeout)
   at System.ServiceModel.Security.SymmetricSecurityProtocol.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Security.WrapperSecurityCommunicationObject.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.SecurityChannelFactory`1.ClientSecurityChannel`1.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.CallOpenOnce.System.ServiceModel.Channels.ServiceChannel.ICallOnce.Call(ServiceChannel channel,TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.CallOnceManager.CallOnce(TimeSpan timeout,CallOnceManager cascade)
   at System.ServiceModel.Channels.ServiceChannel.EnsureOpened(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action,Boolean oneway,ProxyOperationRuntime operation,Object[] ins,Object[] outs,TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action,Object[] outs)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall,ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

调整服务绑定对我来说就像在冰上行走一样瘦,以至于我几乎在水上行走,所以让我们忽视到目前为止我失败了,并从一张干净的床单开始.

我应该如何配置服务以便彼此(和我)很好地玩？