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I'm trying to create a messenger-like program, which user will enter an IP adress and connect to another user and send messages with a send button, and receive and view messages at a textbox. But my problem: "The target machine actively refused". I'm trying to connect myself for testing using 127.0.0.1, what is wrong at this?

Imports System.IO
Imports System.Threading
Imports System.Net.Sockets

Public Class datsend

    Public dinleyici As New TcpListener(33333)


    Dim client As New TcpClient
    Dim msg As String = ""

    Private Sub calis_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles calis.Click
        If Val(port.Text) = 0 Then
            MsgBox("Port missing!")
        ElseIf Val(IP.Text) = 0 Then
            MsgBox("IP missing!")
        Else
            Dim ipAddress As Net.IPAddress = Net.Dns.GetHostEntry("127.0.0.1").AddressList(0)


            dinleyici.Start()
            Thread.Sleep(50)
            dinlet.Start()
        End If
    End Sub



    Private Sub dinlet_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles dinlet.Tick
        If dinleyici.Pending = 1 Then
            msg = ""
            client = dinleyici.AcceptTcpClient
            Dim okuyucu As New StreamReader(client.GetStream)
            While okuyucu.Peek > -1
                msg = msg & Convert.ToChar(okuyucu.Read).ToString
            End While

            cevap.Text = msg

        End If
    End Sub

    Private Sub gonder_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles gonder.Click
        client = New TcpClient("127.0.0.1", Val(port.Text) + 1)
        Dim yazici As New StreamWriter(client.GetStream)
        yazici.Write(mesaj.Text)
        Thread.Sleep(50)
        yazici.Flush()
    End Sub

End Class
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