My remoting application work on XP but does not work on Windows Server 2003

Hello

I have a application that call helper(MarshalByRef) classes and they return the business objects(serializable) instances to client side, then I am binding my user controls to the returned local objects. Every thing is fine on XP but after deploying my remote classes(Helpers) to windows 2003, in the client application when I try to set properties the application freezes. When I traced, I saw they are trying to put the values in transport proxy instead of local instances.

My host is IIS.

Regards

Mohsen