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

A piece of code that I've been working on lately started to throw exceptions when calling a web service using a generated client. The logg file contained only the exception message:
"The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state."

Most of the suggestions found in Web blamed the invalid code, giving examples similar to the following one:

using (MyWebServiceClient service = new MyWegServiceClient())
{
   service.DoSomeOperation();
   service.Close();
   service.DoAnotherOperation();
}

Since I was sure this was not the case I had to discover the real exception reason by myself.

Solution:
After debugging the app it came out that solution was quite simple - the service configuration (URL, security settings) was invalid. I found that out by analyzing the InnerException of the main Exception. The logged exception message was rather irrelevant to the actuall error.