R – .NET IE BHO Remoting

I have a IE Browser Helper Object, which is a Toolbar addin for IE 8.
I have another .NET .EXE application (Remoting Client) that connects to this BHO (Remoting Server) using remoting via common Interface.
When I test the communication between the .EXE application and a TEMP Console application with the same code used in the Server component, it communicates fine, and runs the remote Method.

However, when i try and communicate with the BHO server with security on the TCP cahannel ON ChannelServices.RegisterChannel(tcpClientChannel, true); , I get a "FileNotFoundException" Could not load file or assembly "xxxx" which "xxxx" is the common Interface assembly that contains the Server Methods.

When i try and communicate with the BHO server with security on the TCP cahannel OFF ChannelServices.RegisterChannel(tcpClientChannel, false); , I get error "connection to the remote object was forcably closed".

If I re-test it with the simple test console app it work.

Im starting to believe the problem is with the way remoting works inside a BHO instance… Has anyone used Remoting in a BHO .NET instance, Im using the SPICIE library to create the BHO using .NET.

COMMON Interface assembly for Remoting Interface Object
namespace WWie.CommonClasses
{
class WWieRemote : MarshalByRefObject, WWieClassLibrary.WWieCommonClass.IGetHtmlElement
{
public string GetElementClicked()
{
return ("Returned from WWieRemote ");
}

    public void SetElementClicked(string str)
    {
        MessageBox.Show("SetElement " + str);
    }

}

}

CLIENT APP
static TcpChannel tcpClientChannel = new TcpChannel();
public static WWieClassLibrary.WWieCommonClass.IGetHtmlElement remoteObject;
ChannelServices.RegisterChannel(tcpClientChannel, false);
remoteObject = (WWieClassLibrary.WWieCommonClass.IGetHtmlElement)Activator.GetObject(typeof(WWieClassLibrary.WWieCommonClass.IGetHtmlElement), "tcp://localhost:9002/TestWWie");

testing with remote method call

    remoteObject.SetElementClicked("from Client");   

SERVER BHO
TcpChannel tcpServerChannel = new TcpChannel(9002);
ChannelServices.RegisterChannel(tcpServerChannel, true);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(WWieClassLibrary.WWieCommonClass.IGetHtmlElement), "TestWWie", WellKnownObjectMode.Singleton);