C# UDPClient send data over global network

Question

Server Code :

    Thread thdUDPServer;
    private void Server_Load(object sender, EventArgs e)
    {
        thdUDPServer = new Thread(new ThreadStart(serverThread));
        thdUDPServer.Start();
    }

    UdpClient udpClient;
    public void serverThread()
    {
        udpClient = new UdpClient(53);
        while (true)
        {
            IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
            Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
            string returnData = Encoding.ASCII.GetString(receiveBytes);
            listBox1.Items.Add(RemoteIpEndPoint.Address.ToString() + ":" + returnData.ToString());
        }
    }

Client Code :

    UdpClient udpClient;
    private void Client_Load(object sender, EventArgs e)
    {
        udpClient = new UdpClient();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        udpClient.Connect(textBox1.Text, 53);
        Byte[] senddata = Encoding.ASCII.GetBytes("Hello World");
        udpClient.Send(senddata, senddata.Length);
    }

Working on local network but i need global.

Details :

• Microsoft Defender off.
• Run as admin (For Server App and Client App)

Example :

udpClient.Connect(95.10.xxx.13, 53);

Where am I doing wrong? How can i send data over global network using another method?