VB.net Program not receiving UDP packets

[Pierre_1965]

Hello

Ten years ago I wrote a VS Visual Basic application to receive messages sent by my android smartphone in UPD on my PC.

Today I'm trying to use this application again, but it's not receiving anything.

I know that the android app works and sends requests because I receive them on my PC with an application like UDP Test Tool (https://udp-test-tool.informer.com).

So the problem is on the PC side. I tried different examples of code to receive UDP packets, with or without thread, but without success.

Here's an example:

Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click

    'https://learn.microsoft.com/fr-fr/dotnet/framework/network-programming/using-udp-services
    Dim listenPort As Integer = 13000
    Dim listener As New UdpClient(listenPort)
    Dim groupEP As New IPEndPoint(IPAddress.Any, listenPort)

    Try
        While True
            Console.WriteLine("Waiting for broadcast")
            Dim bytes As Byte() = listener.Receive(groupEP)
            Console.WriteLine("Received broadcast from {groupEP} :")
            Dim receiveString As String = Encoding.ASCII.GetString(bytes)
            Label_Reception.Text = receiveString
        End While

    Catch ex As SocketException
        Console.WriteLine(ex.ToString())
    Finally
        listener.Close()
    End Try

End Sub

On the Windows Defender firewall, I authorized the receiving Visual Basic PC application to communicate (private network).

On the Box side, I tried to open the port used, but I don't really know what to do.

But to no avail, my application still receives nothing and I don't know what to do.

That's why I'm asking for your help.

thanks

[Pierre_1965]

Thanks
I will test this tomorrow monday.

[Pierre_1965]

Unfortunatly , this didn't change nothing.

[Niya]

I know that the android app works and sends requests because I receive them on my PC with an application like UDP Test Tool (https://udp-test-tool.informer.com).

Then the problem has to be with your application. I don't trust IPAddress.Any. Try using your PC's actual IP address first and see if that works.

[Pierre_1965]

Thanks Niya

I solved my problem by disabling the firewall for the private network.

It was the same problem with PC's actual IP instade of IPAddress.Any.