catching WCF FaultException

Can we see ur Service Contract Interface class and how ur throwing the fault exception ?

Sorry for the delay in replying.

I throw the exception as follows within my validator:

public override void Validate(string userName, string password)
        {
           
                    throw new FaultException("User " + userName + " is already logged in to the service");
           
        }

And here is the contract interface (not in its entirety):

[ServiceContract(Name="Service", Namespace="http://Service.com", SessionMode=SessionMode.Required)]
    [ServiceKnownType(typeof(sVehicleInput))]
    [ServiceKnownType(typeof(dPoint))]
    public interface IDstService
    {
        [OperationContract(IsInitiating = true, IsTerminating = false, IsOneWay = false)]
        void InvokeService();

        [OperationContract(IsInitiating = false, IsTerminating = true, IsOneWay = false)]
        [FaultContract(typeof(FaultExceptionCustomType))]
        void CleanUpAndCloseService();
    }



       
   

Is there any callee method to your validate method which is cathing this exception and throwing MessageSecurityException ?

Are you using ExceptionShielding using Ent Lib?

I'm attempting to catch the faultExeption within my client application but it is caught either as a MessageSecurityException or a CommunicationsException (which I belive is the base class for both FaultExeption and MessageSecurityException).  I'm currently dealing with this by including the InnerException in my exception handling.  I'm not throwing MessageSecurityException from within the client - I'm actually wrapping all exceptions into a custom one and throwing that.

I'm not using ExceptionShielding.  

You should throw the error like below and not the normal way.

public override void Validate(string userName, string password)
        {
           
                  //if your custom exception type gets the detail in constructor use below way. Else use your appropriate way to se the message to the instance.
                    throw new FaultException<FaultExceptionCustomType>( new FaultExceptionCustomType("User " + userName + " is already logged in to the service"));
           
        }

Tried it but still coming back as MessageSecurityException.

Just for info, the validator is a separate assembly to the service.  It's in it's own DLL.  I tell the service to use the validator as follows:

<userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="Validator.CustomPasswordValidator, Validator"/>

Thanks for sharing the information.

Thanks for your efforts apeter!