Hi,
I tryed the proxy under XP. It works as well as under Winn2003.
So it must be a problem with Win2000 or COM1.0.

Here some Details:

//#######################  AssemblyInfo.cs: #######################
using System.EnterpriseServices;
using System.Reflection;
[assembly : AssemblyTitle("MediaLogics.CommonDataService")]
[assembly : ApplicationName("MediaLogics.CommonDataService.v1.0.17")]
[assembly : ApplicationID("BBFD7C4F-9136-4a54-A73E-AB42E0D4CCC8")]
[assembly : Description("MediaLogics.CommonDataService.v1.0.17")]
[assembly : ApplicationActivation(ActivationOption.Server)]
[assembly : ApplicationAccessControl(true,
    Authentication     = AuthenticationOption.Privacy,
    ImpersonationLevel = ImpersonationLevelOption.Impersonate,
    AccessChecksLevel  = AccessChecksLevelOption.ApplicationComponent)]

//#######################  Service.cs: #######################
[ComponentAccessControl(true)]
    [SecurityRole("TVExpressUsers", true)]
    [SecureMethod]
    [JustInTimeActivation]
    [Synchronization]
    [ProgId("MediaLogics.CommonDataService")]
    [EventTrackingEnabled(true)]
    [ClassInterface(ClassInterfaceType.None)]
    [Guid("4CB513CA-825A-4f87-BCE5-CD6D52B53392")]
    [ConstructionEnabled(Enabled = true, Default = "Data Source=ora_ml2; User ID=admin; password=adabas")]
    public class CommonDataService : ServicedComponent, ICommonDataService, IProcessInitializer
    {
        private UserInfo userInfo;
        private ILog logger = LogManager.GetLogger("CommonDataServer");
        private string connectionString = null;
        private Cache cache = HttpRuntime.Cache;
        private CommonDataDataLayer dataLayer;

        protected override void Activate()
        {
            //do something
        }

        protected override void Construct(string  connectionString)
        {
            //do something

        }

        [AutoComplete]
        string ICommonDataService.GetCustomerName(int customerId)
        {
                return dataLayer.GetCustomerName(customerId);
        }
        // more...
}

I appreciative for any help...

king regars,

Andreas Wegmann