Chat Program - Target Machine Actively Refused Connection

Jun 4, 2011

How to make a chat program. Well I just copied code in and the program worked. I can send a message to the server and it sends it back just fine. But I can only send a message once. If I try to send another message I get an error and it says this "A first chance exception of type 'System.Net.Sockets.SocketException' occurred in System.dll" then it "No connection could be made because the target machine actively refused it 127.0.0.1:500".
Here is the link to the tutorial and code: [URL]

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[Code]...

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[Code]...

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This problem occurs only when 2 or more clients try to simultaneously connect to the server. For a single client accessing at a time the problem does not occur. The code segment is as given below:

-----------1 Module
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Imports System.Net
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[Code] .....

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[ERROR]
System.Net.Sockets.SocketException:No connection could be made because the target machine actively refused it 192.168.0.59:500 at system.Net.Sockets.TCPClient.Connect(String hostname, Int32 port) at WinClient.Form1.btnSignIn_Click(Object sender, EventArgs e)
[/ERROR]

Though I dont believe the issue is with the code here it is:[code]......

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[CODE].....................

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