Problem bei TCP (WSA error)

; MegaChat
#include <File.au3>
#include <GuiIPAddress.au3>
#include <Inet.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>

Opt("OnExitFunc", "_endscript")
Opt("MustDeclareVars", 1)

Global $title = "MegaChat", $l_port_startValue = 10000, $r_port_startValue = 20000, $left = 100, $logPath = 'MegaChat.log'

If WinExists($title) Then
$title &= ' 2'
$l_port_startValue = 20000
$r_port_startValue = 10000
$left += 500
$logPath = 'MegaChat2.log'
EndIf

Global $GUI
Global $l_hostname_I, $l_ip_IC, $l_port_I, $listen_B
Global $r_hostname_I, $r_ip_IC, $r_port_I, $connect_B
Global $comm_E, $send_E, $send_B

#Region ### START Koda GUI section ### Form=c:\dokumente und einstellungen\xf01145\eigene dateien\chat.kxf
$GUI = GUICreate($title, 445, 508, $left, 111)

GUICtrlCreateGroup("Local settings", 10, 10, 420, 105)
GUICtrlCreateLabel("Hostname", 20, 30, 52, 17)
$l_hostname_I = GUICtrlCreateInput(@ComputerName, 105, 25, 131, 21)
GUICtrlCreateLabel("IP-address", 20, 55, 54, 17)
$l_ip_IC = _GUICtrlIpAddress_Create($GUI, 105, 50, 130, 21)
_GUICtrlIpAddress_Set($l_ip_IC, @IPAddress1)
GUICtrlCreateLabel("Listener-Port", 20, 80, 63, 17)
$l_port_I = GUICtrlCreateInput($l_port_startValue, 105, 75, 131, 21)
$listen_B = GUICtrlCreateButton("Listen", 275, 25, 120, 25, $WS_GROUP)
GUICtrlCreateGroup("", -99, -99, 1, 1)

GUICtrlCreateGroup("Remote settings", 10, 115, 420, 105)
GUICtrlCreateLabel("Hostname", 20, 135, 52, 17)
$r_hostname_I = GUICtrlCreateInput("not connected ...", 105, 130, 131, 21)
GUICtrlCreateLabel("IP-address", 20, 160, 54, 17)
$r_ip_IC = _GUICtrlIpAddress_Create($GUI, 105, 155, 130, 21)
_GUICtrlIpAddress_Set($r_ip_IC, @IPAddress1)
GUICtrlCreateLabel("Listener-Port", 20, 185, 63, 17)
$r_port_I = GUICtrlCreateInput($r_port_startValue, 105, 180, 131, 21)
$connect_B = GUICtrlCreateButton("Connect", 280, 130, 120, 25, $WS_GROUP)
GUICtrlCreateGroup("", -99, -99, 1, 1)

GUICtrlCreateGroup("Communication summary", 10, 220, 420, 155)
$comm_E = GUICtrlCreateEdit("", 15, 235, 410, 134)
GUICtrlCreateGroup("", -99, -99, 1, 1)

GUICtrlCreateGroup("Communication send", 10, 375, 420, 95)
$send_E = GUICtrlCreateEdit("", 15, 390, 410, 74)
GUICtrlCreateGroup("", -99, -99, 1, 1)

$send_B = GUICtrlCreateButton("Send", 10, 475, 90, 25, $WS_GROUP)
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###

; Start The TCP Services
;==============================================
TCPStartup()
; Initialize a variable to represent a server-connection
;==============================================
Global $ConnectedSocket = -1
; Initialize a variable to represent a client-connection
;==============================================
Global $ConnectedToSocket = -1
Global $recv

_main()

Func _main()
Local $nMsg

While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
Case $listen_B
_listen()
Case $connect_B
_connect()
Case $send_B
If $ConnectedToSocket <> -1 Then
_send()
Else
_FileWriteLog($logPath, 'You are not connected!')
MsgBox(16, 'Error', 'You are not connected!', 5)
EndIf
EndSwitch
If $ConnectedSocket <> -1 Then _receive()
WEnd
EndFunc ;==>_main

Func _send()
Local $txt = GUICtrlRead($send_E)
If $txt <> '' Then TCPSend($ConnectedToSocket, $txt)
; If the send failed with @error then the socket has disconnected
;----------------------------------------------------------------
If @error Then
_FileWriteLog($logPath, 'TCPSend error')
Else
GUICtrlSetData($comm_E, _
@UserName & " : " & $txt & @CRLF & GUICtrlRead($comm_E))
GUICtrlSetData($send_E, '')
EndIf
EndFunc ;==>_send

Func _connect()
;Attempt to connect to SERVER at its IP and PORT
;=======================================================
$ConnectedToSocket = TCPConnect(_GUICtrlIpAddress_Get($r_ip_IC), GUICtrlRead($r_port_I))

; If there is an error... show it
If @error Then
MsgBox(4112, "Error", "TCPConnect failed with WSA error: " & @error & @CRLF & 'Maybe nobody is listening ...')
_FileWriteLog($logPath, 'Connecting error')
EndIf
EndFunc ;==>_connect

Func _receive()
; Try to receive (up to) 2048 bytes
;----------------------------------------------------------------
$recv = TCPRecv($ConnectedSocket, 2048)

; If the receive failed with @error then the socket has disconnected
;----------------------------------------------------------------
If @error Then
_FileWriteLog($logPath, 'Disconnected')
$ConnectedSocket = -1
EndIf

; Update the edit control with what we have received
;----------------------------------------------------------------
If $recv <> "" Then GUICtrlSetData($comm_E, _
GUICtrlRead($r_hostname_I) & " -> " & $recv & @CRLF & GUICtrlRead($comm_E))
EndFunc ;==>_receive

Func _listen()
; Create a Listening "SOCKET"
;==============================================
Local $MainSocket = TCPListen(@IPAddress1, GUICtrlRead($l_port_I), 100)
If $MainSocket = -1 Then
_FileWriteLog($logPath, 'TCPListen error')
Exit
EndIf

;Wait for and Accept a connection
;==============================================
Local $start = TimerInit()
Do
$ConnectedSocket = TCPAccept($MainSocket)
Until $ConnectedSocket <> -1 Or (TimerDiff($start) > 25000)

; Get IP of client connecting
Local $szIP_Accepted = SocketToIP($ConnectedSocket)
GUICtrlSetData($r_hostname_I, _TCPIpToName($szIP_Accepted))
EndFunc ;==>_listen

; Function to return IP Address from a connected socket.
;----------------------------------------------------------------------
Func SocketToIP($SHOCKET)
Local $sockaddr, $aRet

$sockaddr = DllStructCreate("short;ushort;uint;char[8]")

$aRet = DllCall("Ws2_32.dll", "int", "getpeername", "int", $SHOCKET, _
"ptr", DllStructGetPtr($sockaddr), "int*", DllStructGetSize($sockaddr))
If Not @error And $aRet[0] = 0 Then
$aRet = DllCall("Ws2_32.dll", "str", "inet_ntoa", "int", DllStructGetData($sockaddr, 3))
If Not @error Then $aRet = $aRet[0]
Else
$aRet = 0
EndIf

$sockaddr = 0

Return $aRet
EndFunc ;==>SocketToIP

Func _endscript()
TCPCloseSocket($ConnectedSocket)
TCPShutdown()
Exit (0)
EndFunc ;==>_endscript