防火墙阻止wcf lan客户端

我在windows 7操作系统上托管了WCF windows服务,并在windows XP PC上安装了客户端应用程序。WIN-7防火墙阻止了我的XP客户端应用程序,当我在WIN-7上禁用防火墙时,客户端应用程序运行良好。我怎样才能克服这个问题。我正在使用 安全模式=“无”

客户端配置文件

<system.serviceModel>
    <bindings>
        <netNamedPipeBinding>
            <binding name="NetNamedPipeBinding_IDataService" >
                <security mode="Transport">
                    <transport protectionLevel="EncryptAndSign" />
                </security>
            </binding>
        </netNamedPipeBinding>
        <netTcpBinding>
            <binding name="NetTcpBinding_IDataService">
                <security mode="None">                        
                </security>
            </binding>
        </netTcpBinding>
    </bindings>
    <client>
        <endpoint address="net.tcp://localhost:8523/DataServices" binding="netTcpBinding"
            bindingConfiguration="NetTcpBinding_IDataService" contract="DataServiceReference.IDataService"
            name="NetTcpBinding_IDataService" />
        <endpoint address="net.pipe://localhost/" binding="netNamedPipeBinding"
            bindingConfiguration="NetNamedPipeBinding_IDataService" contract="DataServiceReference.IDataService"
            name="NetNamedPipeBinding_IDataService">                
        </endpoint>
    </client>
</system.serviceModel>