Question

I have hosted my WCF windows service on WINDOWS 7 OS and have client application on windows-XP PC. WIN-7 firewall is blocking my XP client app, when I disabled firewall on Win-7, client app is working nicely. how I can overcome this problem. I am using security mode=”none” for all lan based client app.

Client side config file

<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>

Answer 1

You overcome the problem by disabling the firewall. There is nothing you can do within the WCF config that can get round a firewall on the host machine. If the port you bind to is blocked then no data will ever reach the end point.