WCF: Warum schlägt die Weitergabe an einem Remote-Endpunkt fehl?

Question

WCF: Warum schlägt die Weitergabe eines Remote-Endpunkts fehl, wenn derselbe Endpunkt über die Konfigurationsdatei übertragen wird?

Dies funktioniert:

Using con As New OfferingTap.OfferingTapClient(New ServiceModel.InstanceContext(callback), "NetTcpBinding_IOfferingTap" 

Dies gilt nicht:

Using con As New OfferingTap.OfferingTapClient(New ServiceModel.InstanceContext(callback), "NetTcpBinding_IOfferingTap", "net.tcp://qa1offerings:8190/") 

Konfigurationsdatei Auszug:

 <endpoint address="net.tcp://qa1offerings:8190/" binding="netTcpBinding" 
      bindingConfiguration="NetTcpBinding_IOfferingTap" contract="OfferingTap.IOfferingTap" 
      name="NetTcpBinding_IOfferingTap"> 

Ausnahme:

System.ServiceModel.Security.SecurityNegotiationException was unhandled 
    Message="A call to SSPI failed, see inner exception." 
    Source="mscorlib" 
    StackTrace: 
    Server stack trace: 
     at System.ServiceModel.Channels.WindowsStreamSecurityUpgradeProvider.WindowsStreamSecurityUpgradeInitiator.OnInitiateUpgrade(Stream stream, SecurityMessageProperty& remoteSecurity) 
     at System.ServiceModel.Channels.StreamSecurityUpgradeInitiatorBase.InitiateUpgrade(Stream stream) 
     at System.ServiceModel.Channels.ConnectionUpgradeHelper.InitiateUpgrade(StreamUpgradeInitiator upgradeInitiator, IConnection& connection, ClientFramingDecoder decoder, IDefaultCommunicationTimeouts defaultTimeouts, TimeoutHelper& timeoutHelper) 
     at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.SendPreamble(IConnection connection, ArraySegment`1 preamble, TimeoutHelper& timeoutHelper) 
     at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.DuplexConnectionPoolHelper.AcceptPooledConnection(IConnection connection, TimeoutHelper& timeoutHelper) 
     at System.ServiceModel.Channels.ConnectionPoolHelper.EstablishConnection(TimeSpan timeout) 
     at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.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, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs) 
     at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation) 
     at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) 
    Exception rethrown at [0]: 
     at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) 
     at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) 
     at Offering_Server_Recorder.OfferingTap.IOfferingTap.RequestFeed(Int32 dataSourceKey) 
     at Offering_Server_Recorder.OfferingTap.OfferingTapClient.RequestFeed(Int32 dataSourceKey) in C:\Documents and Settings\jallen\Local Settings\Application Data\Temporary Projects\Offering Server Recorder\Service References\OfferingTap\Reference.vb:line 471 
     at Offering_Server_Recorder.Module1.Main() in C:\Documents and Settings\jallen\Local Settings\Application Data\Temporary Projects\Offering Server Recorder\Module1.vb:line 9 
     at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) 
     at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) 
     at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() 
     at System.Threading.ThreadHelper.ThreadStart_Context(Object state) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
     at System.Threading.ThreadHelper.ThreadStart() 
    InnerException: System.Security.Authentication.AuthenticationException 
     Message="A call to SSPI failed, see inner exception." 
     Source="System" 
     StackTrace: 
      at System.Net.Security.NegoState.ProcessAuthentication(LazyAsyncResult lazyResult) 
      at System.Net.Security.NegotiateStream.AuthenticateAsClient(NetworkCredential credential, String targetName, ProtectionLevel requiredProtectionLevel, TokenImpersonationLevel allowedImpersonationLevel) 
      at System.ServiceModel.Channels.WindowsStreamSecurityUpgradeProvider.WindowsStreamSecurityUpgradeInitiator.OnInitiateUpgrade(Stream stream, SecurityMessageProperty& remoteSecurity) 
     InnerException: System.ComponentModel.Win32Exception 
      ErrorCode=-2147467259 
      Message="The target principal name is incorrect" 
      NativeErrorCode=-2146893022 
      InnerException: 

Answer 1

Offenbar müssen Sie eine leere SpnEndpointIdentity übergeben, damit dies funktioniert.

Using con As New OfferingTap.OfferingTapClient(_ 
     New ServiceModel.InstanceContext(callback), "NetTcpBinding_IOfferingTap", _ 
     New ServiceModel.EndpointAddress(New Uri("net.tcp://qa1offerings:8190/"), _ 
     New ServiceModel.SpnEndpointIdentity("")))