google compute engine + socket

Question

I'm running a socket server on a Google compute engine with static IP, heres how I start the server:

public class Server {

private static int port=4800;

public static void main(String argv[]) throws Exception {
    System.out.println("STARTED ON PORT 4800!");

    @SuppressWarnings("resource")
    ServerSocket socketIn = new ServerSocket(port);

    while (true) {
        Socket socketConenection = socketIn.accept();
        Thread t = new Thread(new ServerThread(socketConnection, connection));
        t.start();
    }
}

}

public static BufferedReader conectServer(String body, String function) throws IOException {
    Socket socketClient = new Socket(ipServer, portServer);
    DataOutputStream outToServer = new DataOutputStream(socketClient.getOutputStream());
    BufferedReader fromServer = new BufferedReader(new InputStreamReader(socketClient.getInputStream()));
    outToServer.writeBytes(function+ '\n' + body + '\n');
    return fromServer;
}

So using my android app I try to connect to the server, it runs ok on my home PC, but when I try to connect to my Google Compute Engine VM it times out:

java.net.ConnectException: failed to connect to /146.148.66.128 (port 4800): connect failed: ETIMEDOUT (Connection timed out)

E. Anderson E. Anderson · Accepted Answer · 2016-05-11T11:22:36

Sorry if this is obvious, but did you open the firewall on the GCE VM?

By default, GCE VMs have all traffic except SSH blocked from the internet.

google compute engine + socket

1 Answers