Socket connection program works for localhost but not for other ip

[Pramod P Deore]

Hi all, I have one socket connection program as
// For server

import java.net.*;
import java.io.*;

public class FileServer {
  public static void main (String [] args ) throws IOException {
    // create socket
    ServerSocket servsock = new ServerSocket(13267);
    while (true) {
      System.out.println("Waiting...");

      Socket sock = servsock.accept();
      System.out.println("Accepted connection : " + sock);

      // sendfile
      File myFile = new File ("source.txt");
	
      byte [] mybytearray  = new byte [(int)myFile.length()];
      FileInputStream fis = new FileInputStream(myFile);
      BufferedInputStream bis = new BufferedInputStream(fis);
      bis.read(mybytearray,0,mybytearray.length);
      OutputStream os = sock.getOutputStream();
      System.out.println("Sending...");
      os.write(mybytearray,0,mybytearray.length);
      os.flush();
      sock.close();
      }
    }
}

//for client

import java.net.*;
import java.io.*;

public class FileClient{
  public static void main (String [] args ) throws IOException {
    int filesize=6022386; // filesize temporary hardcoded

    long start = System.currentTimeMillis();
    int bytesRead;
    int current = 0;
    // localhost for testing
    Socket sock = new Socket("localhost",13267);
    System.out.println("Connecting...");

    // receive file
    byte [] mybytearray  = new byte [filesize];
    InputStream is = sock.getInputStream();
    FileOutputStream fos = new FileOutputStream("source-copy.txt");
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    bytesRead = is.read(mybytearray,0,mybytearray.length);
    current = bytesRead;

    
    do {
       bytesRead =
          is.read(mybytearray, current, (mybytearray.length-current));
       if(bytesRead >= 0) current += bytesRead;
    } while(bytesRead > -1);

    bos.write(mybytearray, 0 , current);
    bos.flush();
    long end = System.currentTimeMillis();
    System.out.println(end-start);
    bos.close();
    sock.close();
  }
}

when I run this program it create connection and send and data from server successfully. But when I use other machine IP as

Socket sock = new Socket("10.22.35.32",13267);

then on client machine it shows error as connection time-out. and there is no connection established between server and client. Why is it so? I started server program on one pc and run client program from another pc.

[Pramod P Deore]

When I interchange client and server then it works perfectly. But not work for other combination why is it so?

[Rob Spoor]

Sounds like a networking issue. Make sure you can ping the server machine from the client machine. If that works use telnet to check if you can connect to it:

telnet 10.22.35.32 13267

If that already fails then something is blocking access, probably a firewall either on the server machine, on the client machine or on a router between the two.

[Pramod P Deore]

Thanks Rob for response. Yes because of firewall it is blocking access.

[Rob Spoor]

Then you need to add exceptions to the firewall, to allow this traffic.