我有一个似乎无法解决的持久性 WCF 问题。我有一个 WCF Duplex 发布者订阅体系结构。客户端是一个 Windows 窗体应用程序，该服务托管在 Windows 服务中。当通道发生故障时，表单实现回调并使用受保护的代理类分配事件处理程序，以便客户端可以重新连接。
任何时候都有大约 100 个客户订阅。问题是一些客户端停止接收来自服务的消息。故障事件处理程序永远不会在客户端上触发，因此永远不会重新连接。我在服务器和客户端上启用了跟踪，并且服务器上的错误是一致的。它连续抛出大约 5 个异常。我无法确定服务抛出的原因。我认为我得到了一个套接字超时“错误代码 247c”，它是 10060 tcp 套接字超时的十六进制。是什么原因造成的？我猜这个故障不会让客户知道通道已经出现故障。我检查了端口 5000 是否打开。没有防火墙问题.....请帮助。
这是最后一个异常和异常树中最内层节点的跟踪视图：
<InnerException><ExceptionType>System.Net.Sockets.SocketException, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond</Message><StackTrace> at System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
at System.ServiceModel.Channels.SynchronizedMessageSource.SynchronizedAsyncResult`1.End(IAsyncResult result)
at System.ServiceModel.Channels.FramingDuplexSessionChannel.EndReceive(IAsyncResult result)
at System.ServiceModel.Channels.FramingDuplexSessionChannel.TryReceiveAsyncResult.OnReceive(IAsyncResult result)
at System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously)
at System.ServiceModel.Channels.SynchronizedMessageSource.SynchronizedAsyncResult`1.CompleteWithUnlock(Boolean synchronous, Exception exception)
at System.ServiceModel.Channels.SynchronizedMessageSource.ReceiveAsyncResult.OnReceiveComplete(Object state)
at System.ServiceModel.Channels.SessionConnectionReader.OnAsyncReadComplete(Object state)
at System.ServiceModel.Channels.StreamConnection.OnRead(IAsyncResult result)
at System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
at System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult)
at System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously)
at System.ServiceModel.Channels.ConnectionStream.ReadAsyncResult.OnAsyncReadComplete(Object state)
at System.ServiceModel.Channels.TracingConnection.TracingConnectionState.ExecuteCallback()
at System.ServiceModel.Channels.SocketConnection.FinishRead()
at System.ServiceModel.Channels.SocketConnection.AsyncReadCallback(Boolean haveResult, Int32 error, Int32 bytesRead)
at System.ServiceModel.Diagnostics.Utility.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
</StackTrace><ExceptionString>System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond</ExceptionString><NativeErrorCode>274C</NativeErrorCode></InnerException></InnerException></InnerException></Exception>
这是我的客户端 app.config：
<system.serviceModel>
<diagnostics>
<messageLogging logEntireMessage="true"
maxMessagesToLog="1000"
logMessagesAtServiceLevel="true"
logMalformedMessages="true"
logMessagesAtTransportLevel="true" />
</diagnostics>
<bindings>
<netTcpBinding>
<binding name="netTCPEndPoint"
closeTimeout="10:00:00"
openTimeout="10:00:00"
receiveTimeout="10:00:00"
sendTimeout="10:00:00"
listenBacklog="300"
maxBufferPoolSize="1048576"
maxBufferSize="524288"
maxConnections="300"
maxReceivedMessageSize="524288">
<reliableSession inactivityTimeout="10:00:00" enabled="false" />
<security mode="Transport">
<transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
<message clientCredentialType="Windows" />
</security>
</binding>
</netTcpBinding>
</bindings>
<client>
<endpoint address="net.tcp://ccccc.************:5000/ClientNotificationService/tcp"
binding="netTcpBinding" bindingConfiguration="netTCPEndPoint"
contract="NotificationService.ClientNotificationServiceService"
name="netTCPEndPoint">
<identity>
<userPrincipalName value="" />
</identity>
</endpoint>
</client>
</system.serviceModel>
这是我的服务 app.config：
<bindings>
<netTcpBinding>
<binding name="BindingTimeout"
closeTimeout="10:00:00"
openTimeout="10:00:00"
receiveTimeout="10:00:00"
sendTimeout="10:00:00"
listenBacklog="1000"
maxBufferPoolSize="10485760"
maxBufferSize="5242880"
maxConnections="1000"
maxReceivedMessageSize="5242880">
<reliableSession inactivityTimeout="10:00:00" enabled="false" />
<security mode="Transport">
<transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
<message clientCredentialType="Windows" />
</security>
</binding>
</netTcpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="NotificationService.ClientNotificationServiceBehavior">
<serviceThrottling maxConcurrentCalls="1000" maxConcurrentSessions="1000"
maxConcurrentInstances="1000" />
<serviceMetadata httpGetEnabled="true" />
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service behaviorConfiguration="NotificationService.ClientNotificationServiceBehavior"
name="NotificationService.ClientNotificationService">
<endpoint address="net.tcp://xxxx.*******:5000/ClientNotificationService/tcp"
binding="netTcpBinding" bindingConfiguration="BindingTimeout"
name="netTCPEndPoint" contract="NotificationService.IClientNotificationService">
<identity>
<userPrincipalName value="" />
<dns value="http://xxxx.*******" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" bindingConfiguration=""
name="mexEndPoint" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="http://xxxx.*******:3081/NotificationService/ClientNotificationService" />
</baseAddresses>
</host>
</service>
</services>
谢谢你。