WCF, client can't connect unless on same machine

Question

I have a simple ASP.NET web app which uses a WCF Client to talk to a simple WCF backed Windows Service.

All worked fine in local environments. We deployed to dev, which also worked fine. However on DEV - the Web server and App server are on the same machine.

Now that we have deployed to QA, we get the 'The socket connection was aborted. ' exception thrown immedately. For some reason, our QA Web server cannot talk to our QA app server via our WCF client/service. I can ping the QA app server from the web server I can telnet the QA app server from the web server I can connect to the HTTP WSDL on the QA app server from the web server

AND, I can connect FINE to my QA service from my LOCAL environment / visual studio !!!

So why can't my QA ASP.NET app talk to my QA WCF Windows service? I have tried and in every way possible, and still no go...

Here is my System.ServiceModel section on client:

<system.serviceModel>
    <bindings>
      <netTcpBinding>
        <binding name="BigFileBinding">
          <!-- required to receive files greater then default size of 16kb -->
          <readerQuotas maxArrayLength="5242880"/>
        </binding>
      </netTcpBinding>
    </bindings>
    <client>
      <endpoint address="net.tcp://NJQACNET01:58887/PriceService"
          binding="netTcpBinding"
          contract="IPriceService"
          bindingConfiguration="BigFileBinding"/>
      </endpoint>
    </client>
  </system.serviceModel>

Here is my system.servicemodel section on the service:

<system.serviceModel>
    <bindings>
      <netTcpBinding>
        <!-- required to receive files greater then default size of 16kb -->
        <binding name="BigFileBinding"
                 maxReceivedMessageSize="5242880">
          <readerQuotas maxArrayLength="5242880"/>
        </binding>
      </netTcpBinding>
    </bindings>
    <services>
      <service behaviorConfiguration="MetaDataBehavior" name="RK.Pricing.PricingPortal.MarketableSecuritiesService.PriceService">
        <endpoint address="net.tcp://localhost:58887/PriceService" binding="netTcpBinding"
          contract="RK.Pricing.PricingPortal.MarketableSecuritiesService.IPriceService" bindingConfiguration="BigFileBinding"   />
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"  />
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:58889/PriceService" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="MetaDataBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>

Thank you very much for any help! It is greatly appreciated..

Answer 1

This is probably a firewall problem, the port you are using is blocked between the ASP.Net QA server ans the WCF QA Server.

You can test this using the telnet command.

Answer 2

I think this is likely a security problem. Keep in mind that by default, NetTcpBinding use Windows authentication.

You should review and follow the guidelines published here if possible.