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Editorial Team
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Asked: 2026-05-29T05:30:17+00:00

I have followed this tutorial for building my chat application. When I try to

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I have followed this tutorial for building my chat application. When I try to add reference of my service I get the following error:

Contract requires Duplex, but Binding
‘BasicHttpBinding’ doesn’t support it
or isn’t configured properly to
support it.

My web.config is as follows:

<extensions>
  <bindingExtensions>
    <add name="pollingDuplex" type="System.ServiceModel.Configuration.PollingDuplexHttpBindingCollectionElement,System.ServiceModel.PollingDuplex, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
  </bindingExtensions>
</extensions>

<bindings>      
  <pollingDuplex>
    <binding name="chatPollingDuplex" duplexMode="MultipleMessagesPerPoll"/>
  </pollingDuplex>
</bindings>    

<services>      
  <service name="PrototypeSite.ChatService">        
    <endpoint address="" binding="pollingDuplex" bindingConfiguration="chatPollingDuplex" contract="PrototypeSite.ChatService" />
    <endpoint address="mex" binding="wsDualHttpBinding" contract="IMetadataExchange"/>
  </service>      
</services>
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1 Answer

  1. Editorial Team

    When I’d got this error, It made a lot of pain for me, but the solution was quite simple – double check service name in your web.config.

    wherever you have service in the same web assembly or not, you have to include full TypeName of your service

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