连接被拒绝：connect，java socket

Question

I am new using java socket. I have a problem I can´t solve. I have a server with a public IP, on it java server executes, then i have an android app client. With the socket i get to communicate from the client to the server, the problem comes when i try to do it the opposite way. I tried sending a confirmation message from the server to the client. It doesn´t matter how many time i try because i always end up having this error:

java.net.ConnectException: Connection refused: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at java.net.Socket.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:211)
at server.ServerEntrada.run(ServerEntrada.java:48)
at java.lang.Thread.run(Thread.java:748)

I have router port 9000 and 9001 open.

The client sends through the port 9000 the data, and server recives them. Then the server sends them through port 9001 while the app is waiting through

Answer 1

if(password.equals("asd")){
    System.out.println("Abriendo socket");
    socketSalida = new Socket(socketEntrada.getInetAddress().getHostAddress(),puertoSalida);
    DataOutputStream datosSalida = new DataOutputStream(socketSalida.getOutputStream());
    datosSalida.writeUTF("OK");
}

The problem is here. Your server is trying to connect to your client, but it can't, as your client is a client, not a server.

And it doesn't need to. It already has a connection to the client, the one it read the password from. Change it to this:

if(password.equals("asd")){
    System.out.println("Abriendo socket");
    DataOutputStream datosSalida = new DataOutputStream(socketEntrada.getOutputStream());
    datosSalida.writeUTF("OK");
}