.NET remoting IIS Problem

HI,

I have a problem setting .NET Remoting in IIS. We are running a client windows application that access a Singleton Remoting object on and Application server using IIS. When I have Integrated Security AND Anonymous access turned on everything works fine. When I turn OFF anonymous access I keep getting an exception thrown from the client:

System.Net.WebException: The remote server returned an error: (401) Unauthorized.

The strange thing is that in the event log – I shows a successful logon to IIS. I have tried using impersonation on the server, and this did nothing.

Does anyone have any ideas what might be wrong?

Thanks