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Android socket connection with a server

I'm trying to connect my Android phone with a Server. On the Server runs a program written in C#. I've tryed to make it with the following code but it doesn't work.
This is the Android code
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Socket socket;
int port = 52301;
String ip = "79.16.115.30";
Button b = (Button) findViewById(R.id.myButton);
assert b != null;
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
byte[] b = ip.getBytes();
/*SocketAddress socketAddress = new InetSocketAddress(ip, port);
socket.connect(socketAddress);*/
socket = new Socket(ip, port);
Toast.makeText(v.getContext(), "CONNESSO", Toast.LENGTH_SHORT).show();
} catch (UnknownHostException e) {
Toast.makeText(v.getContext(), "CHI MINCHIA è COSTUI", Toast.LENGTH_SHORT).show();
}catch(IOException e) {
Toast.makeText(v.getContext(), "NO I/O", Toast.LENGTH_SHORT).show();
}
catch (Exception e)
{
String cause = "Message: " + e.getMessage();
Toast.makeText(v.getContext(), cause, Toast.LENGTH_SHORT).show();
}
}
});
}
I've tryed also to use the code commented but it doesn't work;
This is the program that runs on the Server:
static void Main(string[] args)
{
string ip = Get_external_ip();
int port = 52301;
int max = 10;
IPAddress ipAddress = IPAddress.Parse("192.168.1.56");
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, port); //setto i parametri del socket
Socket sockServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //creo il socket
Socket client;
Console.WriteLine(ip);
try
{
sockServer.Bind(localEndPoint);
sockServer.Listen(max);
while (true)
{
client = sockServer.Accept();
Console.WriteLine(client.RemoteEndPoint.ToString());
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Console.ReadLine();
}
private static string Get_external_ip()
{
try
{
WebClient client = new WebClient();
return client.DownloadString("http://icanhazip.com/").TrimEnd('\r', '\n');
}
catch (Exception e)
{
return e.Message;
}
}

First of all, use background Thread for network.
I will give you my working snippet. Try to apply it for your needs.
public class YourClass {
//Server socket variables
private ServerSocket serverSocket;
private DataOutputStream dataOutputStream;
private DataInputStream dataInputStream;
private Socket client;
....
private class SocketServerThread extends Thread {
private int port;
private SocketServerThread(int port) {
this.port = port;
}
#Override
public void run() {
dataInputStream = null;
dataOutputStream = null;
try {
serverSocket = new ServerSocket(port);
isSockedOpened = true;
client = serverSocket.accept(); //wait for client
isClientConnected = true;
Log.d(TAG, "Client connected: " + client.getInetAddress().getHostAddress());
dataInputStream = new DataInputStream(
client.getInputStream());
dataOutputStream = new DataOutputStream(
client.getOutputStream());
String messageFromClient;
while (isClientConnected) {
messageFromClient = dataInputStream.readLine();
handleIncomingMessage(messageFromClient);
}
}
} catch (IOException e) {
Log.e(TAG, e.getMessage());
} catch (NullPointerException e) {
Log.e(TAG, e.getMessage());
}
}
}
To open connection:
public void connect(int port) {
this.port = port;
Thread socketServerThread = new Thread(new SocketServerThread(port));
socketServerThread.start();
}
That's how you check if client connected;
public boolean isConnected() {
return serverSocket.isBound() || client.isConnected();
}
To disconnect:
public void disconnect(boolean needsGathering) {
if (isSockedOpened) {
try {
if (serverSocket != null) {
serverSocket.close();
}
if (dataOutputStream != null) {
dataOutputStream.close();
}
if (dataInputStream != null) {
dataInputStream.close();
}
if (client != null) {
client.close();
}
} catch (IOException e) {
Log.e(TAG, "Couldn't get I/O for the connection");
Log.e(TAG, e.getMessage());
}
} else {
Log.d(TAG, "Socket was not opened");
}
}
}

Android Socket Listener Only Runs Once

I have an Android application that is currently using a Socket Listener to listen for incoming connections from a C# application. I am able to get the C# application to send a string to the Android application, but the Socket Listener only seems to accept/execute the necessary code to write the information out only once, but continues to accept incoming connection requests from the C# application.
I have searched through Stackoverflow and spent plenty of time on Google, but can't seem to nail down the exact cause for this issue. Below is my code.
Android Code
public class ScoringActivity extends Activity
{
InputStream is;
private String ipAddress = "";
ProgressDialog progress;
private TextView serverStatus;
// DEFAULT IP
public static String SERVERIP = "10.0.2.2";
// DESIGNATE A PORT
public static final int SERVERPORT = 6000;
private Handler handler = new Handler();
private ServerSocket serverSocket;
#Override
protected void onCreate(Bundle savedInstanceState)
{
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
super.onCreate(savedInstanceState);
setContentView(R.layout.scoring);
Intent intent= getIntent();
ipAddress = intent.getStringExtra("ipAddress");
setProgressBarIndeterminateVisibility(false);
Thread fst = new Thread(new ServerThread());
fst.start();
}
public class ServerThread implements Runnable
{
public void run()
{
try
{
if (SERVERIP != null)
{
handler.post(new Runnable()
{
#Override
public void run()
{
Log.d("Listening on IP: ", SERVERIP + " " + SERVERPORT);
}
});
serverSocket = new ServerSocket(SERVERPORT);
while (true)
{
// LISTEN FOR INCOMING CLIENTS
Socket client = serverSocket.accept();
handler.post(new Runnable()
{
#Override
public void run()
{
Log.d("Connected.","Connected.");
}
});
try
{
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
String line = null;
while ((line = in.readLine()) != null)
{
Log.d("ServerActivity", line);
handler.post(new Runnable()
{
#Override
public void run()
{
Log.d("In the run method", "in the run method");
}
});
}
in.close();
break;
} catch (Exception e)
{
handler.post(new Runnable()
{
#Override
public void run()
{
Log.d("Oops. Connection interrupted. Please reconnect your phones.","Oops. Connection interrupted. Please reconnect your phones.");
}
});
e.printStackTrace();
}
}
} else
{
handler.post(new Runnable()
{
#Override
public void run()
{
Log.d("Couldn't detect internet connection.","Couldn't detect internet connection.");
}
});
}
} catch (Exception e)
{
handler.post(new Runnable()
{
#Override
public void run()
{
Log.d("Error","Error");
}
});
e.printStackTrace();
}
}
}
}
C# Code
//ProcessSqlFiles();
Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
if (!clientSocket.Connected)
clientSocket.Connect(IPAddress.Parse("127.0.0.1"), 8080);
clientSocket.Send(Encoding.UTF8.GetBytes("Test Input"));
clientSocket.Close();
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}

You're breaking out of the loop:
}
in.close();
break;
Remove the break statement. I think what you may want is continue assuming you want to go back to the start of the infinite loop.

Network stream write is blocked

I am working on a c# application (.net 4) that accepts multiple tcp connections from different clients. There is a single tcp listener that accepts socket. Communication b/w nodes in duplex. Data is sent using Networkstream.Write method and read using Networkstream.read method. For each tcp connection a seperate thread is created.
The problem is, a few days ago we noticed that one of the clients stopped reading data (due to a bug) for 20 minutes. As the connection was not broken, there was no (IO) exception at the server. However, we noticed that data at the other clients was also not going. After 20 minutes, that client again started receiving the data and soon other clients also started receiving the data.
I know that Network stream's write method is a blocking method and we are not using any timeouts. So there is a potential that write has blocked (described here). But as I understood it, there has to be a seperate write buffer for each tcp connection or is there something more at play. Can a send blockage at a tcp connection, effect other tcp connections in the same application?
Here is the pseudo code for write operation. For each connection there is a seperate outgoing queue process by a seperate thread.
public class TCPServerListener : baseConnection
{
private readonly int _Port;
private TcpListener _tcpListener;
private Thread _thread;
private List<TcpClientData> _tcpClientDataList = new List<TcpClientData>();
private long _messageDiscardTimeout;
private bool LoopForClientConnection = true;
public TCPServerListener(int port, ThreadPriority threadPriority)
{
try
{
// init property
}
catch (Exception ex)
{
// log
}
}
public void SendMessageToAll(int type)
{
base.EnqueueMessageToSend(type, _tcpClientDataList);
}
public void SendMessageToList(int type, IList<TcpClient> tcpClientList)
{
base.EnqueueMessageToSend(type, tcpClientList);
}
public void SendMessage(int type, TcpClient tcpClient)
{
base.EnqueueMessageToSend(type, tcpClient);
}
private void AcceptClientConnections()
{
while (LoopForClientConnection)
{
try
{
Socket socket = _tcpListener.AcceptSocket();
TcpClientData tcpClientData = new TcpClientData();
tcpClientData.tcpClientThread = new Thread(new ParameterizedThreadStart(StartAsync));
tcpClientData.tcpClientThread.Priority = _threadPriority;
tcpClientData.tcpClientThread.IsBackground = true;
tcpClientData.tcpClientThread.Name = "CD" + tcpClientData.tcpClientThread.ManagedThreadId;
tcpClientData.tcpClient = new TcpClient();
tcpClientData.tcpClient.Client = socket;
_tcpClientDataList.Add(tcpClientData);
tcpClientData.tcpClientThread.Start(tcpClientData.tcpClient);
}
catch (ThreadAbortException ex)
{
//log
}
catch (Exception ex)
{
//log
}
}
}
public override void Start()
{
base.Start();
_tcpListener = new TcpListener(System.Net.IPAddress.Any, _Port);
_thread = new Thread(AcceptClientConnections);
_thread.Priority = _threadPriority;
_thread.IsBackground = true;
_tcpListener.Start();
_thread.Start();
}
public override void Stop()
{
// stop listener and terminate threads
}
}
public class baseConnection
{
private Thread _InCommingThread;
private Thread _OutGoingThread;
protected ThreadPriority _threadPriority;
protected BlockingCollection<MessageReceived> _InComingMessageQueue = new BlockingCollection<MessageReceived>();
protected BlockingCollection<MessageToSend> _OutgoingMessageQueue = new BlockingCollection<MessageToSend>();
public void StartAsync(Object oTcpClient)
{
TcpClient tcpClient = oTcpClient as TcpClient;
if (tcpClient == null)
return;
using (tcpClient)
{
using (NetworkStream stream = tcpClient.GetStream())
{
stream.ReadTimeout = Timeout.Infinite;
stream.WriteTimeout = Timeout.Infinite;
BinaryReader bodyReader = new BinaryReader(stream);
while (tcpClient.Connected)
{
try
{
int messageType = bodyReader.ReadInt32();
// checks to verify messages
// enqueue message in incoming queue
_InComingMessageQueue.Add(new MessageReceived(messageType, tcpClient));
}
catch (EndOfStreamException ex)
{
// log
break;
}
catch (Exception ex)
{
// log
Thread.Sleep(100);
}
}
//RaiseDisconnected(tcpClient);
}
}
}
public virtual void Start()
{
_InCommingThread = new Thread(HandleInCommingMessnge);
_InCommingThread.Priority = _threadPriority;
_InCommingThread.IsBackground = true;
_InCommingThread.Start();
_OutGoingThread = new Thread(HandleOutgoingQueue);
_OutGoingThread.Priority = _threadPriority;
_OutGoingThread.IsBackground = true;
_OutGoingThread.Start();
}
public virtual void Stop()
{
// stop the threads and free up resources
}
protected void EnqueueMessageToSend(int type, List<TcpClientData> tcpClientDataList)
{
tcpClientDataList.ForEach(x => _OutgoingMessageQueue.Add(new MessageToSend(type, x.tcpClient)));
}
protected void EnqueueMessageToSend(int type, IList<TcpClient> tcpClientList)
{
foreach (TcpClient tcpClient in tcpClientList)
{
_OutgoingMessageQueue.Add(new MessageToSend(type, tcpClient));
}
}
protected void EnqueueMessageToSend(int type, TcpClient tcpClient)
{
_OutgoingMessageQueue.Add(new MessageToSend(type, tcpClient));
}
private void HandleOutgoingQueue()
{
while (true)
{
try
{
MessageToSend message = _OutgoingMessageQueue.Take();
if (message.tcpClient.Connected)
{
BinaryWriter writer = new BinaryWriter(message.tcpClient.GetStream());
writer.Write(message.type);
}
}
catch (ThreadAbortException ex)
{
// log
return;
}
catch (Exception ex)
{
//_logger.Error(ex.Message, ex);
}
}
}
private void HandleInCommingMessnge()
{
while (true)
{
try
{
MessageReceived messageReceived = _InComingMessageQueue.Take();
// handle message
}
catch (ThreadAbortException ex)
{
// log
return;
}
catch (Exception ex)
{
// log
//_logger.Error(ex.Message, ex);
}
}
}
public class MessageReceived
{
public MessageReceived(int type, TcpClient tcpClient)
{
this.tcpClient = tcpClient;
this.type = type;
}
public int type;
public TcpClient tcpClient;
}
public class MessageToSend
{
public MessageToSend(int type, TcpClient tcpClient)
{
this.tcpClient = tcpClient;
this.type = type;
}
public int type;
public TcpClient tcpClient;
}
public class TcpClientData
{
public Thread tcpClientThread;
public TcpClient tcpClient;
}
}

You mention that for each connection a separate thread is created, but the code you have shown seems to be able to dequeue a message for any connection.
If this code is running on multiple threads, the program will block as soon as every thread is currently trying to send a message to the blocking connection. Another problem you may face if this loop runs on multiple threads is that messages may not arrive in the correct order for the same connection.

Couldn't establish connection to TcpListener

For the last 2 weeks I've been trying to solve a problem, apparently unsuccessfully.
I have a server, using TcpListener class, and a client, using TcpClient class.
My tests were using 2 computers in my internal home network (level 1 router).
Trying to connect, client-computer got "connection request timeout" exception.
What I've already tried:
Running the client and the server on the same computer - worked
Listening on 0.0.0.0 port 6666 (check with netstat to make sure that the server is listening)
Disable both client and server firewalls
Trying to connect my remote application with telnet (to reject "client code bug" possibilty)
Installing telnet on both computers, and connecting successfully.
Still my server does not seem to get any connection. Client computer is Windows XP and server computer is Windows 7.
Please help, I'm really stuck on this one.
Edit - Server code ->
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace Utils
{
public class ClientConnection
{
public ClientConnection(IPHostEntry hostName, TcpClient client)
{
HostName = hostName;
Client = client;
}
public IPHostEntry HostName { get; set; }
public TcpClient Client { get; set; }
}
public class SocketServer : IDisposable
{
private const int DefaultRecieveSize = 1024;
protected const int ReceiveTimeoutBeforeQuiting = 5000;
private readonly Encoding _defaultEncoding = Encoding.ASCII;
private readonly TcpListener _socket;
protected Dictionary<IPAddress, ClientConnection> Clients;
private static object _locker;
private readonly AutoResetEvent _listeningStopEvent;
private readonly Thread _listeningThread;
private readonly AutoResetEvent _acceptNewClientEvent;
public delegate void ClientsListChangedEvent();
public event ClientsListChangedEvent ClientsChangedEvent;
private Timer _refreshClientsTimer;
private static int _updateClientListInterval;
#region Ctors
protected SocketServer(int port)
{
_socket = new TcpListener(IPAddress.Parse("0.0.0.0"),port);
Clients = new Dictionary<IPAddress, ClientConnection>();
_updateClientListInterval = Convert.ToInt32(ConfigurationManager.AppSettings["UpdateClientListInterval"]);
_listeningThread = new Thread(AcceptNewConnections);
_listeningStopEvent = new AutoResetEvent(false);
_acceptNewClientEvent = new AutoResetEvent(false);
_locker = new object();
_socket.Start();
}
#endregion
#region Send methods
protected void SendString(IPAddress client, string data)
{
// implementation here
}
#endregion
#region Receieve methods
protected MemoryStream GetInputDataAsMemoryStream(IPAddress client)
{
// implementation here
}
protected string GetInputDataAsMemoryString(IPAddress client)
{
// implementation here
}
protected string GetInputDataAsMemoryString(IPAddress client, int timeout)
{
// implementation here
}
#endregion
#region Listening methons
public void StopListening()
{
_listeningStopEvent.Set();
// todo : check if works
_refreshClientsTimer.Dispose();
}
public bool StartListening()
{
if (_listeningThread.ThreadState == ThreadState.Unstarted)
{
_listeningThread.Start();
// start refreshing clients list too. update clients list every 10 seconds
_refreshClientsTimer = new Timer(UpdateList, null, 0, _updateClientListInterval * 1000);
return true;
}
return false;
}
private void AddClientCallback(IAsyncResult ar)
{
// get all needed data before entering lock
if (_socket != null)
{
TcpClient client;
try
{
client = _socket.EndAcceptTcpClient(ar);
}
catch (ObjectDisposedException)
{
// probebly server has been closed. exit
return;
}
var clientEndPoint = client.Client.RemoteEndPoint;
var ip = SocketFunctions.ExtractIpFromEndPoint(clientEndPoint);
IPHostEntry hostName;
try
{
hostName = SocketFunctions.ExtractHostnameFromEndPoint(clientEndPoint);
}
catch(SocketException)
{
// error while parsing from ip to host name. Put default
hostName = new IPHostEntry();
}
// check if given ip already connected
if (!Clients.ContainsKey(ip))
{
lock (_locker)
{
Clients.Add(ip, new ClientConnection(hostName, client));
}
// notify that a new clients has been added
ClientsChangedEvent.Invoke();
}
}
// a new client has accepted
_acceptNewClientEvent.Set();
}
private void AcceptNewConnections(object obj)
{
var shouldStop = false;
while (!shouldStop)
{
_socket.BeginAcceptTcpClient(AddClientCallback, null);
AutoResetEvent[] events = { _listeningStopEvent, _acceptNewClientEvent };
var result = WaitHandle.WaitAny(events);
if (result == 0)
{
shouldStop = true;
}
}
}
#endregion
public List<KeyValuePair<string, string>> GetConnectedClients()
{
var connectedClients = new List<KeyValuePair<string, string>>();
lock (_locker)
{
foreach (var client in Clients)
{
// get only connected clients. Don`t remove - next Timer round will do it anyway and I don`t want to lock _clients
if (client.Value.Client.Connected)
{
connectedClients.Add(new KeyValuePair<string, string>(client.Key.ToString(), client.Value.HostName.HostName));
}
}
}
return connectedClients;
}
private static void CheckConnectionStatus(TcpClient client)
{
if (client.Client.Poll(0, SelectMode.SelectRead))
{
var checkConn = new byte[1];
checkConn[0] = 0;
try
{
if (client.Client.Receive(checkConn, SocketFlags.Peek) == 0)
{
throw new IOException();
}
}
catch (SocketException)
{
// for me, both exceptions mean that there was a conncetion error. Throw IOException for this case too
throw new IOException();
}
}
}
public void UpdateList(object obj)
{
// iterate each client and check its state. Remove if not connected
var tempClients = new Dictionary<IPAddress, ClientConnection>(Clients);
var changedOccurred = false;
lock (_locker)
{
foreach (var client in Clients)
{
try
{
CheckConnectionStatus(client.Value.Client);
}
catch (IOException)
{
// client is not connected anymore
tempClients.Remove(client.Key);
changedOccurred = true;
}
}
}
if (changedOccurred)
{
lock (_locker)
{
Clients = tempClients;
}
// notify that a new clients has been added
ClientsChangedEvent.Invoke();
}
}
#region IDisposble
public void Dispose()
{
if (_socket != null)
{
StopListening();
_socket.Stop();
}
}
#endregion
}
}

How to fix "a connection attempt failed because the connected party did not properly respond after a period of time ..." error?

I'm making a game in C# and I want to display the progress (movements and so on) of opponent. So I send events in game via TCP protocol to opponent.
I've already tried my application on localhost and it works but when I try to use my external address in order to communicate over the internet I get the error below in class TcpInformer.Connect():
a connection attempt failed because the connected party did not properly respond after a
period of time, or established connection failed because connected host has failed to
respond (my external IP address):(port)
I thought the problem was that I was behind NAT. But I've already set up portforwarding for port 49731 on IP 10.0.0.1 and nothing changed.
My second guess was Windows firewall but even when I stopped the firewall my app didn't start working.
My code for connecting of the two PCs is:
TcpInformer peer;
TcpHost server;
public void PrepareConnection() // for server (host)
{
playerType = PlayerType.One;
server = new TcpHost(form, this);
server.Start("10.0.0.1", 49731);
}
public void PrepareConnection2() // for client
{
playerType = PlayerType.Two;
peer = new TcpInformer(form, this);
peer.Connect("MY EXTERNAL IP", 49731);
}
// classes TcpHost and TcpInformer
public interface ITcpCommunication
{
#region Operations (3) 
void ReadData();
void SendData(byte[] message);
void SendData(byte[] message, int size);
#endregion Operations 
}
public class TcpInformer : ITcpCommunication
{
#region Fields (9) 
private NetworkStream con_ns;
private TcpClient con_server;
private bool connected;
private Fmain form;
private SecondPlayer player;
private int port;
private string server;
private string stringData;
#endregion Fields 
#region Delegates and Events (1)
// Events (1) 
public event SimulationEventHandler ReadEvent;
#endregion Delegates and Events 
#region Constructors (1) 
public TcpInformer(Fmain form, SecondPlayer player)
{
this.form = form;
connected = false;
this.player = player;
}
#endregion Constructors 
#region Methods (6) 
// Public Methods (5) 
///
///
///
/// e.g., server = "127.0.0.1"
/// e.g., port = 9050
public void Connect(string server, int port)
{
this.port = port;
this.server = server;
connected = true;
try
{
con_server = new TcpClient(this.server, this.port);
}
catch (SocketException ex)
{
connected = false;
MessageBox.Show("Unable to connect to server" + ex.Message);
return;
}
con_ns = con_server.GetStream();
}
public void Disconnect()
{
form.Debug("Disconnecting from server...", "Player2Net");
con_ns.Close();
con_server.Close();
}
public void ReadData()
{
if (con_ns != null)
{
if (con_ns.DataAvailable)
{
byte[] data = new byte[1200];
int received = con_ns.Read(data, 0, data.Length);
player.ProcessReceivedData(data, received);
}
}
else
{
form.Debug("Warning: con_ns is not inicialized.","player2");
}
}
public void SendData(byte[] message)
{
con_ns.Write(message, 0, message.Length);
con_ns.Flush();
}
public void SendData(byte[] message, int size)
{
if (con_ns != null)
{
con_ns.Write(message, 0, size);
}
}
// Private Methods (1) 
private void Debug(string message)
{
form.Debug("Connected to: " + server + "port: " + port.ToString() + ": " + message, "Player2Net");
}
#endregion Methods 
}
public class TcpHost : ITcpCommunication
{
#region Fields (9) 
private ASCIIEncoding enc;
private Fmain form;
private TcpListener listener;
private SecondPlayer player;
private int port;
private Socket s;
private string server;
private bool state;
#endregion Fields 
#region Delegates and Events (1)
// Events (1) 
public event SimulationEventHandler ReadEvent;
#endregion Delegates and Events 
#region Constructors (1) 
public TcpHost(Fmain form, SecondPlayer player)
{
this.player = player;
this.form = form;
state = false;
enc = new ASCIIEncoding();
}
#endregion Constructors 
#region Methods (5) 
// Public Methods (5) 
public void Close()
{
state = false;
s.Close();
listener.Stop();
}
public void ReadData()
{
if (state == true)
{
if (s.Available > 0) // if there's any data
{
byte[] data = new byte[1200];
int received = s.Receive(data);
player.ProcessReceivedData(data, received);
}
}
}
public void SendData(byte[] message)
{
if (state == true)
{
s.Send(message);
}
}
public void SendData(byte[] message, int size)
{
if (state == true)
{
s.Send(message, size, SocketFlags.None);
}
}
public void Start(string p_ipAddress, int listenPort)
{
//IPAddress ipAddress = IPAddress.Loopback
IPAddress ipAddress = IPAddress.Parse(p_ipAddress);
IPEndPoint ipLocalEndPoint = new IPEndPoint(ipAddress, listenPort);
//listener = new TcpListener(ipAddress, listenPort);
listener = new TcpListener(ipLocalEndPoint);
server = "[provider]";
port = listenPort;
listener.Start();
form.Debug("Server is running", "Player1Net");
form.Debug("Listening on port " + listenPort, "Player1Net");
form.Debug("Waiting for connections...", "Player1Net");
s = listener.AcceptSocket();
form.Debug("Connection accepted from " + s.RemoteEndPoint, "Player1Net");
state = true;
}
#endregion Methods 
}
Is there a way how to check what is wrong?
Help is much appreciated!

I found out what was the problem. I was listening on 10.0.0.1 and trying to reach my external IP (second instance of my program) which is impossible on a computer with one connection to the internet.

I also faced the same problem in AWS VPN.
I changed the proxy.company.com (external ip) to 10.0.0.5.
And it works now.