Failed to connect to an IPC Port: The system cannot find the file specified & Access Denied to IPC

1. I have a simple windows service that contains a simple method HelloServer. And also have the code for IPC port registartion
2. I call the method HelloServer() from a web Service. But it throws exception as "Failed to connect to an IPC Port: The system cannot find the file specified "

How to resove the problem?

Following is the code in the WindowsService to register IPC Server Channel.

Try
Dim props As IDictionary = New Hashtable
props.Add("authorizedGroup", "Everyone")
props.Add("portName", "LstChannel")
props.Add("exclusiveAddressUse", "false")
Dim channel As IpcServerChannel = New IpcServerChannel(props) ', serverProv)

System.Runtime.Remoting.Channels.ChannelServices.RegisterChannel(channel, True)
Catch ex As Exception
'do nothing
EventLog.WriteEntry("IPC Error")
End Try
RemotingConfiguration.RegisterWellKnownServiceType(GetType(Remoting.SampleObject), "ListenerWebService", WellKnownObjectMode.SingleCall)


//Following is the code in the Web Service
Dim ipChannel As IpcClientChannel = New IpcClientChannel()
System.Runtime.Remoting.Channels.ChannelServices.RegisterChannel(ipChannel, True)
IPCobj = CType(Activator.GetObject(GetType(Remoting.SampleObject), "ipc://LstChannel/ListenerWebService"), Remoting.SampleObject)
Return (IPCobj.HelloServer())