我在使用Azure Service Fabric时遇到WCF端点管理器高可用性Windows服务的奇怪问题，该服务在服务变为活动时提供回调。
每次服务变为活动状态时，我们都会使用以下命令注册WCF端点：
A）
serviceHost = CreateServiceHost(IWcfContractInstance)
serviceHost.AddServiceEndpoint(...)
serviceHost.Open()
每当服务被停用时（注意：在这种情况下进程不会停止）
B）
serviceHost.Close()
它们都处于锁定状态，这里没有同步问题。问题是A失败，说端点已经注册。 堆栈跟踪：
System.InvalidOperationException: The ChannelDispatcher at 'net.tcp://localhost:[PORT]/IWcfContract '"ContractName"' is unable to open its IChannelListener. ---> System.InvalidOperationException:
A registration already exists for URI 'net.tcp://localhost:[PORT]/IWcfContract'.
at System.ServiceModel.Channels.UriPrefixTable`1.RegisterUri(Uri uri; HostNameComparisonMode hostNameComparisonMode; TItem item)
at System.ServiceModel.Channels.ConnectionOrientedTransportManager`1.Register(TransportChannelListener channelListener)
at System.ServiceModel.Channels.TransportManager.Open(TransportChannelListener channelListener)
at System.ServiceModel.Channels.TransportManagerContainer.Open(SelectTransportManagersCallback selectTransportManagerCallback)
at System.ServiceModel.Channels.TransportChannelListener.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.ConnectionOrientedTransportChannelListener.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.TcpChannelListener`2.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.Channels.ReliableChannelListenerBase`1.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.Dispatcher.ChannelDispatcher.OnOpen(TimeSpan timeout)
at System.ServiceModel.Dispatcher.ChannelDispatcher.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
奇怪的是B）也失败并抛出CommunicationObjectFaultedException。所以问题是，在故障会话中调用Close应该处理resoureces，这样当我们继续并再次注册这个端点时，它应该正常工作。
我在这里错过了什么吗？