I'm using the example server and client below to make a TCP connection via the internet and on the client it returns the following message:
Additional information: No connection could be made because the target machine actively refused them
The port 5902 via public IP is released, I used another software that opens a TCP connection on that same port and testing with telnet via public IP, connected normally.
Server
using System;
using System.Net.Sockets;
using System.Net;
using System.Threading;
using System.Diagnostics;
namespace Server
{
class Server
{
static ManualResetEvent allDone = new ManualResetEvent(false);
private static void ThreadInfos()
{
while (true)
{
Console.Title = "Unity C# Server - Threads: " + Process.GetCurrentProcess().Threads.Count.ToString();
Thread.Sleep(1000);
}
}
static void Main(string[] args)
{
//Thread to show infos on console title
Thread thread = new Thread(new ThreadStart(ThreadInfos));
thread.Start();
IPEndPoint localEP = new IPEndPoint(IPAddress.Any, 5902);
Console.WriteLine("Local address and port : {0}", localEP.ToString());
Socket listener = new Socket(localEP.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
try
{
listener.Bind(localEP);
listener.Listen(10);
while (true)
{
allDone.Reset();
Console.WriteLine("Waiting for a connection...");
listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);
allDone.WaitOne();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
Console.WriteLine("Closing the listener...");
}
static void AcceptCallback(IAsyncResult ar)
{
// Get the socket that handles the client request.
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
// Signal the main thread to continue.
allDone.Set();
// Create the state object.
StateObject state = new StateObject();
state.WorkSocket = handler;
handler.BeginReceive(state.Buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
public static void ReadCallback(IAsyncResult ar)
{
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.WorkSocket;
// Read data from the client socket.
int read = handler.EndReceive(ar);
// Data was read from the client socket.
if (read > 0)
{
Console.WriteLine("[{0}] read {1} bytes", Thread.CurrentThread.ManagedThreadId, read);
//state.sb.Append(Encoding.ASCII.GetString(state.Buffer, 0, read));
handler.BeginReceive(state.Buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
else
{
/*if (state.sb.Length > 1)
{
// All the data has been read from the client;
// display it on the console.
string content = state.sb.ToString();
Console.WriteLine("[{0}] Read {1} bytes from socket.\n Data : {2}",
Thread.CurrentThread.ManagedThreadId, content.Length, content);
}*/
handler.Close();
}
}
public class StateObject
{
public Socket WorkSocket = null;
public const int BufferSize = 1024;
public byte[] Buffer = new byte[BufferSize];
//public StringBuilder sb = new StringBuilder();
}
}
}
Customer
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.Net;
namespace Client
{
class Program
{
static void Main(string[] args)
{
IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
IPEndPoint remoteEP = new IPEndPoint(IPAddress.Parse("201.35.xxx.xxx"), 5902);
Socket s = new Socket(remoteEP.Address.AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
s.Connect(remoteEP);
Console.WriteLine("Connected, sending a few bytes...");
byte[] bytes = Encoding.ASCII.GetBytes("test");
while (true)
{
s.Send(bytes);
}
s.Close();
s.Dispose();
}
}
}