Ошибка при подключении к серверу через putty

package chat.server;
 
import chat.network.ITCPConnectionListener;
import chat.network.TCPConnection;
 
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
 
 
public class serverMain implements ITCPConnectionListener{
 
    private final ArrayList<TCPConnection> connections = new ArrayList<>();
 
    public static void main(String[] args) {
        new serverMain();
    }
 
    private serverMain(){
 
        System.out.println("Server running");
        try(ServerSocket serverSocket = new ServerSocket(8189)){
 
            while (true){
                try{
                    new TCPConnection(this, serverSocket.accept());
                } catch (IOException e){
                    System.out.println("TCPConnection exception " + e);
                }
            }
 
        } catch (IOException e){
            throw new RuntimeException(e);
        }
    }
 
    private void sendToAllConnections(String value){
        System.out.println(value);
        for (TCPConnection connection : connections) {
            connection.sendString(value);
        }
    }
 
    @Override
    public synchronized void onConnectionReady(TCPConnection tcpConnection) {
        connections.add(tcpConnection);
        sendToAllConnections("Client connected: " + tcpConnection);
    }
 
    @Override
    public synchronized void receiveString(TCPConnection tcpConnection, String value) {
        sendToAllConnections(value);
    }
 
    @Override
    public synchronized void onDisconnect(TCPConnection tcpConnection) {
        connections.remove(tcpConnection);
        sendToAllConnections("Client disconnected: " + tcpConnection);
    }
 
    @Override
    public synchronized void onException(TCPConnection tcpConnection, Exception e) {
        System.out.println("TCPConnection exception: " + e);
    }
}

package chat.network;
 
import java.io.*;
import java.net.Socket;
import java.nio.Buffer;
import java.nio.charset.Charset;
 
public class TCPConnection {
 
    private final Socket socket;
    private final Thread rxThread;
    private final ITCPConnectionListener eventListener;
    private final BufferedReader in;
    private final BufferedWriter out;
 
    public TCPConnection(ITCPConnectionListener eventListener, String ipAddr, int port) throws IOException {
        this(eventListener, new Socket(ipAddr, port));
 
    }
 
    public TCPConnection(ITCPConnectionListener eventListener, Socket socket) throws IOException{
        this.eventListener = eventListener;
        this.socket = socket;
        this.in = new BufferedReader(new InputStreamReader(socket.getInputStream(), Charset.forName("UTF-8")));
        this.out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), Charset.forName("UTF-8")));
        rxThread = new Thread(new Runnable() {
            @Override
            public void run() {
                try{
                    eventListener.onConnectionReady(TCPConnection.this);
                    while(!rxThread.isInterrupted()){
                        eventListener.receiveString(TCPConnection.this, in.readLine());
                    }
                } catch (IOException e){
                    eventListener.onException(TCPConnection.this, e);
                } finally {
                    disconnect();
                }
            }
        });
        rxThread.start();
    }
 
    public synchronized void sendString(String toSend){
        try {
            out.write(toSend + "\r\n");
            out.flush();
        } catch (IOException e) {
            eventListener.onException(TCPConnection.this, e);
            disconnect();
        }
    }
 
    public synchronized void disconnect(){
        rxThread.interrupt();
        try {
            socket.close();
        } catch (IOException e) {
            eventListener.onException(TCPConnection.this, e);
        }
    }
 
    @Override
    public String toString() {
        return "TCPConnection: " + socket.getInetAddress() + ": " + socket.getPort();
    }
}

package chat.network;
 
public interface ITCPConnectionListener {
 
    void onConnectionReady(TCPConnection tcpConnection);
    void receiveString(TCPConnection tcpConnection, String value);
    void onDisconnect(TCPConnection tcpConnection);
    void onException(TCPConnection tcpConnection, Exception e);
 
}