How to get InDesign Server instance on IIS Webservice

    <WebMethod()> _
    Public Function testIDS() As String

        Dim idsAP As InDesignServer.Application = Nothing

        Try
            idsAP = GetObject("myid2")

        Catch ex As Exception
            Return ex.Message
        End Try

        idsAP.Consoleout(" Web Service call test success !(VB) ")

        Return Nothing

    End Function

I can run it correctly on ASP.NET development server, but it will occurred  error on IIS6 .

Is the permission problem? How to solve it ?

I also try this

idsAP = System.Runtime.InteropServices.Marshal.BindToMoniker("myid2")

But, no use !