So I've created a "simple chat app" that works in LAN, but when i try to go outside the LAN it does not work. I've been searching the net for solution and came across lots of stuff, like NAT traversal, port forwarding and so on...None of which i found useful. My question is: How to make my app work across the WAN? I understand that what I want is for 2 PC's to communicate with each other over the internet (one will be client, and the other one will simulate server), and that those PC's are hidden behind routers that use NAT. But i don't know how to make my app work.
SERVER:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Threading;
using System.Net.Sockets;
namespace sukaServer
{
public partial class Form1 : Form
{
Socket sock;
Socket accept;
public Form1()
{
InitializeComponent();
}
Socket socket()
{
return new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
}
private void buttonListenServ_Click(object sender, EventArgs e)
{
sock = socket();
sock.Bind(new IPEndPoint(0, 80));
sock.Listen(0);
new Thread(delegate ()
{
accept = sock.Accept();
MessageBox.Show("CONNECTED!");
sock.Close();
while (true)
{
try
{
byte[] buffer = new byte[255];
int rec = accept.Receive(buffer, 0, buffer.Length, 0);
if (rec <= 0)
{
throw new SocketException();
}
Array.Resize(ref buffer, rec);
Invoke((MethodInvoker)delegate
{
listBoxServer.Items.Add(Encoding.Default.GetString(buffer));
});
}
catch
{
MessageBox.Show("DISCONNECTED!");
sock.Close();
break;
}
}
Environment.Exit(0);
}).Start();
}
private void buttonServerSend_Click(object sender, EventArgs e)
{
byte[] data = Encoding.Default.GetBytes(textBoxServerSend.Text);
accept.Send(data, 0, data.Length, 0);
textBoxServerSend.Clear();
}
}
}
CLIENT:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
namespace suka
{
public partial class Form1 : Form
{
Socket sock;
Socket socket()
{
return new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
}
public Form1()
{
InitializeComponent();
sock = socket();
FormClosing += new FormClosingEventHandler(Form1_FormClosing);
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
sock.Close();
}
private void buttonClientConnect_Click(object sender, EventArgs e)
{
try
{
sock.Connect(new IPEndPoint(IPAddress.Parse(textBoxClientConnect.Text), 80));
new Thread(delegate ()
{
read();
}).Start();
}
catch
{
MessageBox.Show("CANNOT CONNECT!");
}
}
void read()
{
while (true)
{
try
{
byte[] buffer = new byte[255];
int rec = sock.Receive(buffer, 0, buffer.Length, 0);
if (rec <= 0)
{
throw new SocketException();
}
Array.Resize(ref buffer, rec);
Invoke((MethodInvoker)delegate
{
listBoxClient.Items.Add(Encoding.Default.GetString(buffer));
});
}
catch
{
MessageBox.Show("DISCONNECTED!");
sock.Close();
break;
}
}
Environment.Exit(0);
}
private void buttonClientSend_Click(object sender, EventArgs e)
{
byte[] data = Encoding.Default.GetBytes(textBoxClientSend.Text);
sock.Send(data, 0, data.Length, 0);
textBoxClientSend.Clear();
}
}
}
I know that this will smell like a duplicate on the first sight, but none of the posts i saw addressed the SAME EXACT issue, either they want A and B to communicate through a server, or something else. I want A and B chatting, where A is the server, and B is the client or vice versa. And the first thing I want is to make it able to work on internet, later I will address the async issue.
EDIT: Lemme just clarify the "not working" thing.... It throws the exception that im catching and goes through ("CANNOT CONNECT!") part of code.
