3
我的問題是有關由WCF拋出不時一個System.TimeoutException拋出：TimeoutException異常由WCF客戶端代理
System.TimeoutException：開放 操作未分配的 內完成超時時間爲00:00:00。分配給此操作的時間 可能有 是較長超時的一部分。 ---> System.TimeoutException：打開00:00:00後超時，而 建立傳輸會話爲 net.tcp：//192.168.1.100：50000/TabletSvc /。 分配給此操作的時間 可能是較長的 超時的一部分。 ---> System.TimeoutException： 連接到通過 net.tcp：//192.168.1.100：50000/TabletSvc/ 在00:00:00後超時。連接 嘗試了0個可用的 個地址（）。檢查您的頻道的RemoteAddress ，並確認此端點 的 DNS記錄對應於有效的IP地址。分配給此操作的 時間可能是 已超時的更長時間的一部分。
什麼是隨機行爲的可能原因？
WCF服務託管在Windows XP SP2上運行的.NET應用程序中。該應用程序爲託管在另一臺計算機上的相同服務創建客戶端代理。一個重要的方面是服務使用可靠的會話和服務調節。機器通過WiFi連接進行通信。
客戶端和服務位於同一應用程序內的單獨線程上。從這個角度來看，他們不依賴於彼此。應該沒有鎖定。
我使用ping檢查了機器之間的WiFi連接，它似乎很好。下一步將是建立一個網絡監視器，但由於它們是生產機器，它可能不會很快發生。
我想過將maxConcurrentSessions和maxConcurrentInstances都增加到50，但沒有時間去測試它。這是基於這樣的想法，即可能應用程序資源耗盡或達到影響託管服務的限制。
正如我所說的，客戶端代理無法只打開一個連接不時。一分鐘後的第二次嘗試通常會成功。
下面是客戶端和服務配置：
<system.serviceModel>
<client>
<endpoint name="TabletSvcEndpoint" address="net.tcp://localhost:50000/TabletSvc/" binding="netTcpBinding" bindingConfiguration="TabletSvcBinding" contract="ITabletSvc">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
</client>
<services>
<service behaviorConfiguration="TabletSvcBehavior" name="TabletSvc">
<endpoint name="TabletSvcEndpoint" address="" binding="netTcpBinding" bindingConfiguration="TabletSvcBinding" contract="ITabletSvc">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<host>
<baseAddresses>
<add baseAddress="net.tcp://localhost:50000/TabletSvc/" />
</baseAddresses>
</host>
</service>
</services>
<bindings>
<netTcpBinding>
<binding name="TabletSvcBinding" receiveTimeout="00:30:00" sendTimeout="00:00:30" closeTimeout="00:00:05" openTimeout="00:00:05" transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions" hostNameComparisonMode="StrongWildcard" listenBacklog="10" maxBufferPoolSize="524288" maxBufferSize="6553600" maxConnections="10" maxReceivedMessageSize="6553600">
<readerQuotas maxDepth="32" maxStringContentLength="819200" maxArrayLength="163840" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<reliableSession inactivityTimeout="00:01:00" ordered="true" enabled="true" />
<security mode="None" />
</binding>
</netTcpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="TabletSvcBehavior">
<serviceDebug includeExceptionDetailInFaults="true" />
<serviceThrottling maxConcurrentSessions="10" maxConcurrentInstances="10" maxConcurrentCalls="100" />
</behavior>
</serviceBehaviors>
</behaviors>
<diagnostics performanceCounters="Off" wmiProviderEnabled="False" >
<messageLogging maxMessagesToLog="250" logEntireMessage="true" logMessagesAtServiceLevel="true" logMalformedMessages="true" logMessagesAtTransportLevel="true" />
</diagnostics>
</system.serviceModel>
這裏是異常的堆棧跟蹤：
10:20:18.3125 ClientChannel: Opening
10:20:48.8437 ClientChannel: Faulted
10:20:48.8593 Error: System.TimeoutException: The open operation did not complete within the allotted timeout of 00:00:00. The time allotted to this operation may have been a portion of a longer timeout. ---> System.TimeoutException: Open timed out after 00:00:00 while establishing a transport session to net.tcp://192.168.1.100:50000/TabletSvc/. The time allotted to this operation may have been a portion of a longer timeout. ---> System.TimeoutException: Connecting to via net.tcp://192.168.1.100:50000/TabletSvc/ timed out after 00:00:00. Connection attempts were made to 0 of 1 available addresses(). Check the RemoteAddress of your channel and verify that the DNS records for this endpoint correspond to valid IP Addresses. The time allotted to this operation may have been a portion of a longer timeout.
at System.ServiceModel.Channels.SocketConnectionInitiator.CreateTimeoutException(Uri uri, TimeSpan timeout, IPAddress[] addresses, Int32 invalidAddressCount, SocketException innerException)
at System.ServiceModel.Channels.SocketConnectionInitiator.Connect(Uri uri, TimeSpan timeout)
at System.ServiceModel.Channels.BufferedConnectionInitiator.Connect(Uri uri, TimeSpan timeout)
at System.ServiceModel.Channels.TracingConnectionInitiator.Connect(Uri uri, TimeSpan timeout)
at System.ServiceModel.Channels.ConnectionPoolHelper.EstablishConnection(TimeSpan timeout)
--- End of inner exception stack trace ---
at System.ServiceModel.Channels.ConnectionPoolHelper.EstablishConnection(TimeSpan timeout)
at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.OnOpen(TimeSpan timeout)
--- End of inner exception stack trace ---
Server stack trace:
at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.Channels.ReliableChannelBinder`1.ChannelSynchronizer.SyncWaiter.TryGetChannel()
at System.ServiceModel.Channels.ReliableChannelBinder`1.ChannelSynchronizer.SyncWaiter.TryWait(TChannel& channel)
at System.ServiceModel.Channels.ReliableChannelBinder`1.ChannelSynchronizer.TryGetChannel(Boolean canGetChannel, Boolean canCauseFault, TimeSpan timeout, MaskingMode maskingMode, TChannel& channel)
at System.ServiceModel.Channels.ReliableChannelBinder`1.Send(Message message, TimeSpan timeout, MaskingMode maskingMode)
at System.ServiceModel.Channels.SendReceiveReliableRequestor.OnRequest(Message request, TimeSpan timeout, Boolean last)
at System.ServiceModel.Channels.ReliableRequestor.Request(TimeSpan timeout)
at System.ServiceModel.Channels.ClientReliableSession.Open(TimeSpan timeout)
at System.ServiceModel.Channels.ClientReliableDuplexSessionChannel.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)