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Error while deploying to Windows Azure Devevelopment Fabric

At a customer, after installing the Windows Azure SDK version 1.3 , when we tried to deploy their app on the development fabric, Visual Studio throws us the following exception.

System.ServiceModel.CommunicationObjectFaultedException was unhandled

  Message=The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state.

  Source=mscorlib

  StackTrace:

    Server stack trace:

       at System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout)

    Exception rethrown at [0]:

       at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)

       at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)

       at System.ServiceModel.ICommunicationObject.Close(TimeSpan timeout)

       at System.ServiceModel.ClientBase`1.System.ServiceModel.ICommunicationObject.Close(TimeSpan timeout)

       at Microsoft.WindowsAzure.Hosts.WaIISHost.Program.Main(String[] args)

We tried a lot of stuff to get it working. In the end we recreated a new solution from scratch to determine what could be the cause of this issue. Of course everything worked. By comparing the 2 solutions we discovered that our newly created solution was targeting the .NET Framework 4.0 while our existing solution was targeting the .NET Framework 3.5. Changing the target framework from .NET 3.5 to .NET 4.0 solved the problem.

UPDATE We followed some tips in the comments and discovered the root cause of the issue. Because we were using TFS source control the web.config was changed to readonly. Removing the readonly bits solved the problem. I guess that by changing the target framework the readonly attribute was removed by Visual Studio itself.

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