WCF开发常见问题：“There is already a listener on IP endpoint 0.0.0.0:4503”

在寄宿到控制台的WCF服务启动时或者运行期间，经常自己停掉，通过日志记录可以看到

2010/10/27 10:19:08 : There is already a listener on IP endpoint 0.0.0.0:4503. Make sure that you are not trying to use this endpoint multiple times in your application and that there are no other applications listening on this endpoint.

应该是同一个端口被多个服务监听了，查了一下服务的配置，果然如此

代码

<service behaviorConfiguration="WCFService.Behavior" name="WCFService.SynchronizationService">
<host>
<baseAddresses>
<add baseAddress="net.tcp://localhost:4503/SynchronizationService"/>
</baseAddresses>
</host>
<endpoint address="" binding="netTcpBinding" contract="WCFService.ISynchronizationService" bindingConfiguration="netTcpBindConfig"></endpoint>
<endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange" ></endpoint>
</service>

<service behaviorConfiguration="WCFService.Behavior" name="AuthenticateService">
<host>
<baseAddresses>
<add baseAddress="net.tcp://localhost:4503/AuthenticateService"/>
</baseAddresses>
</host>
<endpoint address="" binding="netTcpBinding" contract="IAuthenticateService" bindingConfiguration="netTcpBindConfig"></endpoint>
<endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange" ></endpoint>
</service>

于是将其中一个服务的端口改掉成4504即可。

为了保证端口的唯一性，首先这个端口不能是常见的系统端口，其次不能是其他服务所用的端口。