WCF双工通信外网无法连接

由于项目需要把WCF部署外网，在公司完成程序，测试没有问题，wsDualHttpBinding 双工通信

客户端配置：

<system.serviceModel>
<bindings>
<wsDualHttpBinding>
<binding name="hhh_IBLLServiceContract" closeTimeout="00:01:00"
openTimeout="00:51:00" receiveTimeout="00:50:00" sendTimeout="00:51:00"
bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard"
maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647"
messageEncoding="Mtom" textEncoding="utf-8" useDefaultWebProxy="true">
<readerQuotas maxDepth="64" maxStringContentLength="2147483647" maxArrayLength="2147483647"
maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
<reliableSession ordered="true" inactivityTimeout="00:50:00" />
<security mode="None">
<message clientCredentialType="Windows" negotiateServiceCredential="true" />
</security>
</binding>
</wsDualHttpBinding>
</bindings>
<client>
<endpoint address="http://192.168.9.29:8081/Service1.svc"
binding="wsDualHttpBinding" bindingConfiguration="hhh_IBLLServiceContract"
contract="IBLLServiceContract" name="hhh_IBLLServiceContract">

</endpoint>
</client>
</system.serviceModel>

服务器端配置：

<system.serviceModel>

<bindings>
<wsDualHttpBinding>
<binding name="hhh" messageEncoding="Mtom">
<security mode="None"/>
</binding>
</wsDualHttpBinding>
</bindings>

<services>
<service behaviorConfiguration="serviceBehavior" name="RNOP.WCF.Service.BLLService">
<endpoint address="Service1.svc"
binding="wsDualHttpBinding" bindingName="hhh" bindingConfiguration="hhh" contract="RNOP.WCF.ServiceInterface.IBLLServiceInterface" >
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" >
</endpoint>
<host>
<baseAddresses>
<add baseAddress="http://192.168.9.180:8081/" />
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<serviceBehaviors  >
<behavior name="serviceBehavior">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="False" />
<dataContractSerializer maxItemsInObjectGraph="2147483647" />

</behavior>

</serviceBehaviors>

</behaviors>
</system.serviceModel>

内网测试没有问题，部署到外网，就报超时异常operation may have been a portion of a longer timeout

检查服务器和客户端防火墙是否关闭，防火墙都关闭，依然连接失败；

检查端口是否被占用，更换端口，错误依然；

发现服务的网页上元数据地址使用的是计算机名，而计算机名称在外网是无法访问，于是搜索，在网上发现一篇文章：http://www.cnblogs.com/lensso/archive/2011/08/01/2124095.html

远程客户端由于元数据地址主机名为服务器计算机名而无法解析WCF服务元数据的解决办法

安装文章方法解决的了元数据的地址解析问题。

但是客户端依然无法连接服务端，再次

/article/5414638.html

http://social.msdn.microsoft.com/Forums/en-US/wcfzhchs/thread/0d663107-b47e-464b-82dc-6f191c484870

所以在外网的情况下，程序能正常的工作必须确保：1.客户端没安装IIS6以下的版本，即80端口要被空出来；2是在违反1的条件下，80端口被占用，让你的clientBaseAddress能被服务器所识别。

于是设置地址，客户端正常连接上服务端，问题解决。