CODEWITHSUNDEEP
vb.nettcp
Rattooos
Rattooos

Reputation: 11

VB.Net TCP failing to connect to socket on local connection

I'm having an issue establishing a connection to my TcpClient using the local server address of 127.0.0.1 and port 1000. It attempts to establish a connection and then hits my Catch SocketException that it is unable to find a server.

I've set breakpoints and have went through the code line by line and it catches my exception once the line NetStream = Client.GetStream() is called from within my Try/Catch after pressing my button btnStart. Showing that no connection is being established at all. Why is this?


Public Class frmForm1

    Dim Client As TcpClient 
    Dim connection As Socket 
    Dim NetStream As NetworkStream 



Private Sub btnStartClient_Click(sender As Object, e As EventArgs) Handles btnStartClient.Click

    Try

        txtLog.Text &= "Attempting to connect" 

        Client = New TcpClient()
        Client.Connect(txtAddress.Text, CInt(txtPort.Text))

        NetStream = Client.GetStream() 


    ' Catch errors in trying to connect to server
    Catch SocketEx As SocketException
        txtLog.Text &= "Cannot find server" 
    End Try

End Sub

It shouldn't be throwing my exception and then creating my NetworkStream Reader/Writer objects and print that they were created. As well as setting up the listening thread. However, I cannot even get that far as my Catch SocketException is called at the line NetStream = Client.GetStream()

Upvotes: 0

Views: 264

Answers (1)

Marvin Klar
Marvin Klar

Reputation: 1917

You need at least 2 threads. One for the server to listen and one for the clinet to connect. Make sure to call .Start() on the TcpListener object (Server.Start() in your case) before trying to connect the client to the server.

Upvotes: 1

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