c# - 当尝试从 WCF 服务支持双 LAN 时，WCF 内部异常消息 "A registration already exists for URI ' net.tcp ://. .. .' "

Question

我有一个自托管 WCF 服务，它使用 net.tcp 协议(protocol)作为端点，它在带有普通 LAN 卡的 PC 上运行良好。

但是，我想支持具有双 LAN 卡的 PC，这给我带来了问题。我为两张卡分配了不同的 IP 地址(192.168.1.1 和 193.168.1.1)。然后，我更改了我的 app.config 文件以尝试通过使用第二个 IP 地址为 WCF 服务添加第二个终结点来支持双 LAN。 (我的 WCF 客户端可以选择使用两个端点地址中的哪一个。)

当我运行该服务时，我收到以下错误消息:

The ChannelDispatcher at 'net.tcp://193.168.1.1:59301/MyClientService' with contract(s) "'IMyClientService'" is unable to open its IChannelListener.

Additional information from inner exception: A registration already exists for URI 'net.tcp://193.168.1.1:59301/MyClientService'.

注意:如果我在 app.config 文件中更改第二个端点的端口号(例如，如果我使用 193.168.1.1:59302)，服务将正常启动。这是一种解决方法，但如果可能的话，能够为两个 LAN 使用相同的端口会很有用。

哦，我在绑定(bind)上尝试了 portSharingEnabled(在运行 Net.TCP 端口共享服务的情况下)，但这没有帮助。

提前致谢...

我的 app.config 文件如下所示:

<!-- Information about assembly binding and garbage collection -->
<runtime>
    <generatePublisherEvidence enabled="false"/>
</runtime>

<system.serviceModel>
    <services>
        <service name ="MyNamespace.MyClientService" behaviorConfiguration="MyServiceBehavior">
            <host>
                <baseAddresses>
                    <!-- Using TCP -->
                    <add baseAddress = "net.tcp://localhost:59301/MyClientService/" />
                </baseAddresses>
            </host>

            <!-- Using TCP -->
            <endpoint
                    address="net.tcp://192.168.1.1:59301/MyClientService"
                    binding="netTcpBinding"
                    bindingConfiguration="NetTcpBinding_IMyClientService"
                    contract="MyNamespace.IMyClientService"
            />

            <endpoint
                    address="net.tcp://193.168.1.1:59301/MyClientService"
                    binding="netTcpBinding"
                    bindingConfiguration="NetTcpBinding_IMyClientService"
                    contract="MyNamespace.IMyClientService"
            />


            <!-- Metadata Endpoints -->
            <!-- The Metadata Exchange endpoint is used by the service to describe itself to clients. -->
            <!-- This endpoint does not use a secure binding and should be secured or removed before deployment -->
            <endpoint
                address="mex"
                binding="mexTcpBinding"
                contract="IMetadataExchange"
            />
        </service>

    </services>

    <bindings>

        <!-- ==================================================================================== -->
        <!-- TCP/IP bindings -->

        <netTcpBinding>

            <binding name="NetTcpBinding_IMyClientService" closeTimeout="00:01:00"
                openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
                transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions"
                hostNameComparisonMode="StrongWildcard" listenBacklog="10"
                maxBufferPoolSize="524288" maxBufferSize="2147483647" maxConnections="10"
                maxReceivedMessageSize="2147483647">
                <readerQuotas maxDepth="32" maxStringContentLength="2147483647" maxArrayLength="2147483647"
                    maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" />
                <security mode="None">
                    <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
                    <message clientCredentialType="Windows" />
                </security>
            </binding>

        </netTcpBinding>

    </bindings>

    <behaviors>
        <serviceBehaviors>
            <behavior name="MyServiceBehavior">
                <!-- To avoid disclosing metadata information, 
                set the value below to false and remove the metadata endpoint above before deployment -->
                <!-- <serviceMetadata httpGetEnabled="True"/> -->
                <serviceMetadata/>
                <!-- To receive exception details in faults for debugging purposes, 
                set the value below to true.  Set to false before deployment 
                to avoid disclosing exception information -->
                <serviceDebug includeExceptionDetailInFaults="False" />
            </behavior>
        </serviceBehaviors>
    </behaviors>
</system.serviceModel>

Answer 1

“localhost”解析为什么？

看起来您在“localhost”和两个附加端点上添加了一个基地址，其中一个端点可能会与 localhost 冲突。

尝试删除基地址，看看是否有所不同...