remoting with ipc (access denied)

I succesfully did some remoting between applications.
Now I let a windows service host the remote object. The protocol is ipc.

I get an acces denied error??

Do I need some additional settings for it to work in a w-service?
This is the server side code

Code:

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Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Channels.Ipc
Imports RemoteObject
Imports System.Timers
Imports System.Threading
Imports System.Diagnostics
Imports System.Runtime.InteropServices

PublicClass TrafficService

PrivateWithEvents m_Timer AsNew Timers.Timer
Dim thdServer As Thread

#Region"Event Handlers"

ProtectedOverridesSub OnStart(ByVal args() AsString)
' Add code here to start your service. This method should set things
' in motion so your service can do its work.
thdServer = New Thread(New ThreadStart(AddressOf ServerThread))
thdServer.Start()
m_Timer.Interval = 900000 '1800000
m_Timer.Start()
EndSub
ProtectedOverridesSub OnStop()
' Add code here to perform any tear-down necessary to stop your service.
m_Timer.Stop()
ChannelServices.UnregisterChannel(ChannelServices.GetChannel("serverchannel"))
thdServer.Abort()
EndSub
PrivateSub m_Timer_Elapsed(ByVal sender AsObject, ByVal e As System.Timers.ElapsedEventArgs) Handles m_Timer.Elapsed
Beep()
Beep()
EndSub
#EndRegion'Event Handlers

PublicSub ServerThread()
Dim serverChannel As IChannel = New IpcServerChannel("serverchannel", "msg")
ChannelServices.RegisterChannel(serverChannel, False)
RemotingConfiguration.RegisterWellKnownServiceType( _
GetType(RemObject), "msgAlerter", WellKnownObjectMode.Singleton)
EndSub
EndClass

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thanks in adv , Richard