No connection could be made because the target machine actively refused it

Imports System
Imports System.Net
Imports System.Net.Sockets
Imports System.Threading
Imports System.Text
 
 
' State object for receiving data from remote device.
 
Public Class StateObject
    ' Client socket.
    Public workSocket As Socket = Nothing
    ' Size of receive buffer.
    Public Const BufferSize As Integer = 256
    ' Receive buffer.
    Public buffer(BufferSize) As Byte
    ' Received data string.
    Public sb As New StringBuilder
End Class 'StateObject
 
 
Public Class AsynchronousClient
    ' The port number for the remote device.
    Private Const port As Integer = 11000
 
    ' ManualResetEvent instances signal completion.
    Private Shared connectDone As New ManualResetEvent(False)
    Private Shared sendDone As New ManualResetEvent(False)
    Private Shared receiveDone As New ManualResetEvent(False)
 
    ' The response from the remote device.
    Private Shared response As String = String.Empty
 
 
    Public Shared Sub Main()
        ' Establish the remote endpoint for the socket.
        ' For this example use local machine.
        Dim ipHostInfo As IPHostEntry = Dns.GetHostEntry(Dns.GetHostName())
        Dim ipAddress As IPAddress = ipHostInfo.AddressList(0)
        Dim remoteEP As New IPEndPoint(ipAddress, port)
 
        ' Create a TCP/IP socket.
        Dim client As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
 
        ' Connect to the remote endpoint.
        client.BeginConnect(remoteEP, New AsyncCallback(AddressOf ConnectCallback), client)
 
        ' Wait for connect.
        connectDone.WaitOne()
 
        ' Send test data to the remote device.
        Send(client, "This is a test<EOF>")
        sendDone.WaitOne()
 
        ' Receive the response from the remote device.
        Receive(client)
        receiveDone.WaitOne()
 
        ' Write the response to the console.
        Console.WriteLine("Response received : {0}", response)
 
        ' Release the socket.
        client.Shutdown(SocketShutdown.Both)
        client.Close()
    End Sub 'Main
 
 
    Private Shared Sub ConnectCallback(ByVal ar As IAsyncResult)
        ' Retrieve the socket from the state object.
        Dim client As Socket = CType(ar.AsyncState, Socket)
 
        ' Complete the connection.
        client.EndConnect(ar)            ****************************  ERROR HERE  ****************************
 
        Console.WriteLine("Socket connected to {0}", client.RemoteEndPoint.ToString())
 
        ' Signal that the connection has been made.
        connectDone.Set()
    End Sub 'ConnectCallback
 
 
    Private Shared Sub Receive(ByVal client As Socket)
 
        ' Create the state object.
        Dim state As New StateObject
        state.workSocket = client
 
        ' Begin receiving the data from the remote device.
        client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, New AsyncCallback(AddressOf ReceiveCallback), state)
    End Sub 'Receive
 
 
    Private Shared Sub ReceiveCallback(ByVal ar As IAsyncResult)
 
        ' Retrieve the state object and the client socket 
        ' from the asynchronous state object.
        Dim state As StateObject = CType(ar.AsyncState, StateObject)
        Dim client As Socket = state.workSocket
 
        ' Read data from the remote device.
        Dim bytesRead As Integer = client.EndReceive(ar)
 
        If bytesRead > 0 Then
            ' There might be more data, so store the data received so far.
            state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead))
 
            ' Get the rest of the data.
            client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, New AsyncCallback(AddressOf ReceiveCallback), state)
        Else
            ' All the data has arrived; put it in response.
            If state.sb.Length > 1 Then
                response = state.sb.ToString()
            End If
            ' Signal that all bytes have been received.
            receiveDone.Set()
        End If
    End Sub 'ReceiveCallback
 
 
    Private Shared Sub Send(ByVal client As Socket, ByVal data As String)
        ' Convert the string data to byte data using ASCII encoding.
        Dim byteData As Byte() = Encoding.ASCII.GetBytes(data)
 
        ' Begin sending the data to the remote device.
        client.BeginSend(byteData, 0, byteData.Length, 0, New AsyncCallback(AddressOf SendCallback), client)
    End Sub 'Send
 
 
    Private Shared Sub SendCallback(ByVal ar As IAsyncResult)
        ' Retrieve the socket from the state object.
        Dim client As Socket = CType(ar.AsyncState, Socket)
 
        ' Complete sending the data to the remote device.
        Dim bytesSent As Integer = client.EndSend(ar)
        Console.WriteLine("Sent {0} bytes to server.", bytesSent)
 
        ' Signal that all bytes have been sent.
        sendDone.Set()
    End Sub 'SendCallback
End Class 'AsynchronousClient