Question

I need to build an application which can receive data from over a network and use this data to do some unrelevant things with.

Here’s a piece of code to make clear what I’m doing.

On the server side:

static Socket client = null;
static ServerSocket ss = null;

if (ss != null) {
                ss.close();
            }
            ss = new ServerSocket(5513);
            isrunning = true;
            System.out.println("Waiting for client...");
            client = ss.accept();
            System.out.println("Client accepted.");
            BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));

And the client side:

Socket client = null;
PrintWriter out = null;
                    try {                            
                        client = new Socket("hostname", 5513);
                        out = new PrintWriter(client.getOutputStream(), true);
    }

Please note that this is just a piece of the code. There are no errors in the code.

After running the server-sided piece of code, it correctly waits for the client to connect.

Now here comes the problem. As soon as I try to connect from the client side, I’m getting a “connection refused”-error.

HOWEVER, I found something on the internet whoch told me to try telnetting from the client side. For example, let the server-sided IP be 192.168.1.1. So, after using this command:

    telnet 192.168.1.1 5513

I actually get a connection with the server. The command will launch an empty screen, and everything I manually type in the command line will be sent to the server-side after pressing enter (checked with debugging).

So, I can manually connect to the server-side and send some data, but my code refuses to connect.

Anyone who knows what I am doing wrong?

Answer 1

Is this the code you’re actually using?

client = new Socket("hostname", 5513);

Try changing it to:

client = new Socket("192.168.1.1", 5513);