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我有一个 WCF 服务（不是通过 IIS 托管的），并且我有另一个应用程序通过网络 TCP 与我的 WCF 通信。除了长时间运行之外，一切都很好。我的 WCF 可能会执行诸如运行查询或备份数据库等任务。这些任务可能需要几分钟或几小时才能完成。异步执行这些任务也不是一种选择。

问题：在 15 分钟标记处，套接字连接被中止，我似乎无法弄清楚这是从哪里来的......

下面是 WCF 服务的配置：

<system.serviceModel>
<bindings>
    <netTcpBinding>
        <binding name="NetTcpBindingConfigurationForMyWCF"
                 openTimeout="24:00:00"
                 closeTimeout="24:00:00"
                 sendTimeout="24:00:00"
                 receiveTimeout="24:00:00"
                 maxReceivedMessageSize="9223372036854775807"
                 transferMode="Streamed">
            <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" />
        </binding>
    </netTcpBinding>
</bindings>

<services>
    <service name="Namespace.MyWCF">
        <endpoint address=""
                  binding="netTcpBinding"
                  bindingConfiguration="NetTcpBindingConfigurationForMyWCF"
                  name="NetTcpBindingEndpointMyWCF"
                  contract="MyWCF.IMyWCF" />
        <endpoint address="mex" 
                  binding="mexTcpBinding" 
                  bindingConfiguration="" 
                  name="MexTcpBindingEndpoint" 
                  contract="IMetadataExchange" />
        <host>
            <baseAddresses>
                <add baseAddress="net.tcp://SQLServer/MyWCF" />
            </baseAddresses>
        </host>
    </service>
</services>
<behaviors>
    <serviceBehaviors>
        <behavior name="">
            <dataContractSerializer maxItemsInObjectGraph="2147483646"/>
            <serviceThrottling maxConcurrentCalls="1000" maxConcurrentInstances="1000" maxConcurrentSessions="1000"/>
            <serviceMetadata httpGetEnabled="false" httpsGetEnabled="false" />
            <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior>
    </serviceBehaviors>
</behaviors>

这是我的应用程序的配置：

<system.serviceModel>
<bindings>
    <netTcpBinding>
        <binding name="NetTcpBindingConfigurationForMyWCF"
                 openTimeout="24:00:00"
                 closeTimeout="24:00:00"
                 sendTimeout="24:00:00"
                 receiveTimeout="24:00:00"
                 maxReceivedMessageSize="9223372036854775807"
                 transferMode="Streamed">
            <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" />
        </binding>
    </netTcpBinding>
</bindings>
<client>
    <endpoint address="net.tcp://SQLServer/MyWCF"
              binding="netTcpBinding"
              bindingConfiguration="NetTcpBindingConfigurationForMyWCF"
              contract="MyWCF.IMyWCF"
              name="NetTcpBindingEndpointMyWCF">
    </endpoint>
</client>

到目前为止，这是我拼命尝试的方法，但没有任何运气：
- 将所有超时值设置为 24 小时
- 为 maxConcurrentCalls、maxConcurrentInstances 和 maxConcurrentSessions 添加了带有较大值的 serviceThrottling 配置
- 两台服务器上都禁用了防火墙
- 启用了 nettcpbinding 端口共享
- 启用了可靠会话不活动超时 = 24 小时

无论我尝试什么，我都会在 15 分钟后收到以下错误：

Exception msg: An existing connection was forcibly closed by the remote host
Exception type: System.Net.Sockets.SocketException
Stack trace:    at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.ServiceModel.Channels.SocketConnection.ReadCore(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout, Boolean closing)


Exception msg: The socket connection was aborted. This could be caused by an error processing your message or a receive timeout being exceeded by the remote host, or an underlying network resource issue. Local socket timeout was '23.23:59:59.9843758'.
Exception type: System.ServiceModel.CommunicationException
Stack trace:    at System.ServiceModel.Channels.SocketConnection.ReadCore(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout, Boolean closing)
   at System.ServiceModel.Channels.SocketConnection.Read(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout)
   at System.ServiceModel.Channels.DelegatingConnection.Read(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout)
   at System.ServiceModel.Channels.ConnectionStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count)
   at System.Net.Security.NegotiateStream.StartFrameHeader(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.NegotiateStream.ProcessRead(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
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1 回答 1

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我最终找到了这个超时的根本原因，如果其他人遇到同样的问题，我会回答我自己的问题。

我们服务器之间的所有通信都通过防火墙。我们使用 SonicWall，它具有 TCP 不活动超时配置...默认值是 15 分钟，这是我的超时时间。

我最终实现了一种基于句柄的机制，用于长时间运行的操作。我的调用应用程序将请求一个操作并接收一个句柄作为回报。然后，应用程序可以使用句柄通过定期调用 WCF 来获取操作状态的更新，直到操作完成。

问题解决了！

于 2020-03-19T18:58:44.650 回答