Java server socket response to previouse connected client

Question

I have a Server and two clients.

I have finished i/o with the client A and client B .

Now i need to reconnect to Client A and do some input/output with that client.

I store connectedClientsHistory in a list of String with their ip and ports.

But the problem is that i got Exception java.net.ConnectException: Connection refused: connect

Here is my code:

public class Server extends Thread {

private static int serverPort = 9090;
private static ServerSocket listener;
private static int numberOfConnectedClients;
private static int numberOfPlayers;
List<String> orderOfConnectedClients = new LinkedList<String>();

public Server(int port) throws IOException {
    listener = new ServerSocket(port);
    this.serverPort = port;
}


public static void main(String[] args) throws IOException {
    Thread thread = new Server(9090);
    thread.start();
}

public void run() {

    while (numberOfConnectedClients < numberOfPlayers) {

        try {
            System.out.println("Waiting for clients on server Port " + listener.getLocalPort() + " ...\n");

            Socket connectedClient = listener.accept();
            numberOfConnectedClients++;

            System.out.println("Connected Client ip/port:   " + connectedClient.getRemoteSocketAddress().toString());
            orderOfConnectedClients.add(connectedClient.getRemoteSocketAddress().toString());
            System.out.println("History Connected Clients: " + orderOfConnectedClients);

            DataOutputStream outToClient = new DataOutputStream(connectedClient.getOutputStream());
            InputStream inFromClient = connectedClient.getInputStream();
            DataInputStream in = new DataInputStream(inFromClient);


            if (numberOfConnectedClients == numberOfPlayers) {
                // notify to the first client

                String[] firstClient = orderOfConnectedClients.get(0).split(":");
                System.out.println(firstClient);

                Socket reconnectSocket = new Socket(firstIp, firstPort);
                DataOutputStream outToClient2 = new DataOutputStream(reconnectSocket.getOutputStream());
                outToClient2.writeUTF("Reconnect?");

         // how access to the first client?

            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}