Securing Client Server HTTPs Connection

Mar 1, 2014

I have a https connection from Client to Server and a malware in client. The malware modifies the message and compromises its integrity. I am using a proxy to check the Integrity of the message after the malware has changed the message and before sending it over the internet to the server.

Now, How can I check the Integrity of the message (Sure that it has not been modified by any Man in the Middle) for the second half of my communication channel(Which is from Client to the Server over the internet).

I see few conventional approaches of CRC or Checksum will work. But I am looking for some non traditional or upcoming approaches.

Ideally SSL Data shouldn't be able to be decrypted by any MIM. But my assumption is that any Protocol is subjected to attack and compromised in real world and few recent studies are proving that https is breakable. Thus, I am trying to perform a What if analysis? On the client side, lets say malware is not more powerful than just modifies the transaction amount and destination account number in a typical online Baking transaction.

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Enterprise JavaBeans :: Connection Of Android Client With Java EE Server

Mar 9, 2013

I am using EJB (Stateless) without any web service. I simply need to send a String from Client to Server

I can connect any Java SE Client with this EJB. But how I can connect an Android Client with this EJB (i.e. Using EJBRemote Interface) directly? I am using :

Glassfish Application Server
Netbeans IDE

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Networking :: URL Connection Error On HTTPs

Feb 16, 2013

I have noticed an error, that makes sometimes troubles, when downloading jars from https addresses, when there are many jars to download..

Best example is by opening Javas on Java version checker. [URL] ....

I get also following log...

network: Connecting https://www.java.com/jsp_utils/jreverification.jar with proxy=DIRECT
network: Connecting http://www.java.com:443/ with proxy=DIRECT
network: Connecting https://www.java.com/jsp_utils/jreverification.jar with cookie "JSESSIONID=22ABBA2BE9B5789629C276AC35BDF969; s_cc=true;

Even if the address is https, java try to access via http protocol on port 443, and that leads sometimes to problems..

I have noticed this, when I have used URLConnection(HttpURLConnection) for my self, as soon Java sends http link on https address, the jar gets sometimes not loaded, and i get error about missing class that get called..

On http addres it is not so bad, since same protocol is used, but evidently, that is evil for https..

As you see, that happens already when loading Jar by Applet Starter and at all, it happens each time on any URLConnection

###############################
Java Plug-in 10.13.2.20
Using JRE version 1.7.0_13-b20 Java HotSpot(TM) Client VM
User home directory = X:Usersadmin
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect

[Code] .....

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Java Client To WCF Service - Secured Connection

Oct 14, 2014

I have created a sample java web service client using Apache Axis. It works well with basicHTTPbinding (without security and Basic authentication).I am not able to make a secured communication. How to make it work in a secured way using NTLM or any other security.

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Enabling SSL In JDBC Connection To SYBASE For Thick Client App

Apr 19, 2015

Connection from Java app (installed on desktop) to sybase database (deployed on AIX machine) is going unencrypted.i.e Traffic can be read by some hacking tool and to fix I need to enable SSL/TLS.I am using JDBC to connect to sybase. I believe apart from setting the jconnect properties there are several other things which needs to be done.

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Web Services :: Getting Connection Time Out - JSON Rest Client For POST Request

Mar 23, 2015

I want to write one REST client program for POST request ,request and response is in JSON Format.

public String getAck() {
HttpURLConnection httpConnection = null;
URL url=null;
try {
url = new URL("http://test:8080/ils/main");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();

[Code]....

Line OutputStream os = httpConnection.getOutputStream();

I am getting connection time out problem

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Enterprise JavaBeans :: How To Start A Socket Client Connection With EJB3 Timer Bean

May 28, 2013

I have some embedded systems (with web server) putting their states, sensor values into an XML file.

<sensor1>
<temp>21.4</temp>
<unit>°C</unit>
</sensor1>

Now I played a little with EJB3. I want to start a timer bean in a 10second interval which retrieves the IP of registered devices from a databases, opens client sockets with a Thread Pool and retrieves the XML file over HTTP GET of each device listed in the db.

Is it possbile with EJB3? how to start thread based background services like that within EJB3 timer bean?

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What Happens To Connection Request When Server Is Busy Processing Previous Requests

Jan 31, 2015

I have written the following code to handle multiple Client Request. Lets Assume that it takes server 300 nano seconds(ns) to process one connection request. It recieves two connection requests at time t1 and t1+200ns. Since server is busy handling request 1 at time t1+200ns. what will happen to request 2.if yes what is the max size of that buffer?Maximum number of request that a server process per unit time depends on the java code.Is there also a limit to how many request a server can recieve per unit time?

public class EchoServer
{
public static void main(String args[])
{
ServerSocket serverSocket = null;
BufferedReader readSocket = null;
PrintStream writeSocket = null;
serverSocket = new ServerSocket(9998);

[code]...

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Unable To Check SFTP Connection To Remote Server Using Enchanter Jar

Apr 10, 2014

I am trying to check SFTP connection to remote server using enchanter jar. Mine is not a multi-threaded application. PFB sample code...

.....
SSH ssh = new DefaultSS();
ssh.setTimeOut(10000);
ssh.connect("myserver","myusername","mypassword");
ssh.sendLine("cd /u");
ssh.sendLine("sftp -B batch.file utodldse@claoesdsdd.com");
ssh.getLine();
.....

note - the batch.file contains only 1 statement. Please find below.
---
bye
---

But the above program is getting is stuck at times when the server is not responding. It goes into infinite hung state.

Is there some alternative ways to set timeout ?

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Testing TCP Client And Server

Oct 22, 2014

I am attempting to test a TCP Client and Server for an assignment I am doing in class. The goal here is to "test your client and Server applications by transferring (i) a file having 10,000+ lines (see supplied big-file1.txt having 12000+ lines), (ii) a file having 20,000+ lines (you may create one of your own from big-file1.txt, or obtain a large size file from the Google website at [URL] ...). Then, compute and display the total transfer time of the files at both of the sides separately (your choice in millisecond/second)."

I have created the TCPClient and TCPServer java classes, ran the server first and then the client, and using mathematical formulas to calculate the transfer time. Trouble is, I'm having trouble testing the client and server in the file area and not the area where I had to input a line, let the server print it, and then have the client eliminate the articles from the line. I need testing the file. Here is my code so far:

TCPClient:

package tcpclient;
import java.io.*;
import java.net.*;
public class TCPClient {
public static void main(String[] args) throws IOException{
// TODO Auto-generated method stub
String sentence;

[code] ....

How to fix the code so that the time in seconds does not output as 60 for both files and that the files go through the exchange?

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Client / Server Using PIPE Line?

Apr 20, 2015

I have a program using Pipe line to exchange the infomation in the Client-Server model. Can I separate out main function and then put into Server main and Client main?

//PipeEchoServer
public class PipedEchoServer extends Thread {
PipedInputStream readPipe;
PipedOutputStream writePipe;
PipedEchoServer(PipedInputStream readPipe, PipedOutputStream writePipe){
this.readPipe = readPipe;

[code]....

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How To Add Server Client Relation In Program

Feb 17, 2014

I have to develop a code in parallel which is implemented in sequential yet. How to add the server client relation in the program so that work can be divided into multiple clients.

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Sending Message From One Client To Another Via Server?

Apr 2, 2014

I've just recently started playing around with network programming in Java, and I've come up with a simplistic server than can handle multiple clients and return the IP and port each one is connected to (or I'm under the impression that is so). What I've been requested to do as an exercise by one of the programming teachers at my high school (I'm not in a class, this is my own time) is send a message from one client to the other through the ServerSocket so that it may "watch" everything going on. I'm not sure how to go about this at all.

EDIT : now it never seems to go the the else or else if statements...

That is now the main problem. It never, ever, goes past the first if statement, no matter what it is.

EDIT : Okay, I haven't changed a line of code but suddenly not a single if statement is working. They just stopped. The client simply hangs and I can't type anything.

Server

public class Server implements Runnable {
Socket clientSocket;
Server(Socket clientSocket) {
this.clientSocket = clientSocket;
}
public static void main(String args[]) throws Exception {
ServerSocket ssock = new ServerSocket(3480);
System.out.println("Listening on port 3480");

[code]....

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RMI / How Can Client Send A Message To Server

Sep 3, 2014

I have a problem on how to make my client to send the object to a server.

So I have one interface called "RMIInterface" and client "RMIClient" and server "RMIServer":

RMIInterface
interface RMIInterface {
public String getMessage(String text) throws RemoteException;
}
RMIClient
public class RMIClient {

[code]....

With this program I can connect to a Server with a Client, and print in Client console a message.But, how can I send message from a client to a server, and print that message in server console output?

make the simpliest example with sending a message to a server, edit inteface header code to public interface RMIInterface extends Remote, I forgot to add.

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Client Info On Server Side

Apr 6, 2014

I want to ask that, when a server listen to A port and it accepts a request from a client then the server accepts the request using accept method,but how does the server get the info about the client like wat is the port no and ip address of the client,I read a answer regarding this that Server never gets the port no of client only the ip address and it connects to client using a connection stream but as far I know from networking, a device must have the ip address and port no of the device it wants to connect to.

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Client And Server - Reading From Socket

Jul 22, 2014

So we have a Client and Server. Client opens a socket to Server, server initiates new Thread to handle the communication with client. Is there a way to be singnalled when there is input on socket, so I don't have to use infinite while loop solution?

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EJB / EE :: SSL Works Only If Client And Server Are At Same Host

Jun 9, 2014

I have gf 4.0.1 and swing client. I want to get EJB over SSL. I've set all certificates. However, I can get it work only when client and server are at the same host. What I see in tcpdump when they are at the same host:

10.0.17.2.48524 > 10.0.17.2.3820: Flags [P.], cksum 0x378f (incorrect -> 0xf2b6), seq 399:756, ack 1085, win 273, options [nop,nop,TS val 347297976 ecr 347297966], length 357
13:01:26.334898 IP (tos 0x0, ttl 64, id 51559, offset 0, flags [DF], proto TCP (6), length 665)
10.0.17.2.3820 > 10.0.17.2.48524: Flags [P.], cksum 0x388f (incorrect -> 0x626d), seq 1085:1698, ack 756, win 273, options [nop,nop,TS val 347297977 ecr 347297976], length 613

[code]...

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Running Server And Client From Two Different JButton

Mar 10, 2014

I am looking to run Server and Client from two different JButton.

When I click on start Server button, the server starts to run but I cannot click on start Client button to start the client. Here the code for server:

Java Code:

public void actionPerformed(ActionEvent e) {
Client c = new Client();
c.run();
} mh_sh_highlight_all('java');

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Simple Server / Client Chat

Dec 28, 2014

I've been trying to create a server/client chat program, but I keep running into areas where I'm not really sure how to work it. I've run into a wall where my client just sits and spins instead of working. URL.... I can work out the dynamic parts later, I just want to understand the meat and potatoes of reading from sockets and writing to sockets (and how to do both at the same time).

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SSL Client / Server Mutual Authentication

May 2, 2015

I'm trying to build a SSL mutual authenticating private server. I'm not sure what keystores, truststores, or certificates I need to accomplish this. I made keystores for both programs using:

keytool -genkey -keyalg RSA -alias selfsigned -keystore keystore.jks -storepass password -validity 360 -keysize 2048

The server starts up fine, but when I run the client they both give errors.

Server code:

System.setProperty("javax.net.ssl.keyStore", "CLA.jks");
System.setProperty("javax.net.ssl.keyStorePassword", "password");
SSLServerSocketFactory sslServerSocketfactory = (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();
SSLServerSocket sslServerSocket = (SSLServerSocket)sslServerSocketfactory.createServerSocket(9090);
SSLSocket s = (SSLSocket)sslServerSocket.accept();
BufferedReader in =
new BufferedReader(new InputStreamReader(s.getInputStream()));

[code]...

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RMI With Doing Calculations Across A Server / Client Platform

Apr 6, 2014

It's an RMI program that has to be able to return the mean, mode and median of a set of numbers.It's composed of 4 classes; a client, an implementation class (with the math), an Interface, and a server class.

import java.rmi.NotBoundException;
import java.rmi.RMISecurityManager;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.io.*;
 
[code]....

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Client / Server Chat Program

Dec 6, 2014

So i wrote this text to try and create a simple chat program that does the following: Prepend names to messages, announce entrance and exit of chat, display user list, and share a whiteboard.So far the Server seems to be working but the Chat Client is throwing errors at me left and right..

CURRENT ERROR:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:Windowssystem32>cd..
C:Windows>cd..
C:>Usersjaydesktopchat
'Usersjaydesktopchat' is not recognized as an internal or external command,
operable program or batch file.

[code]....

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Sending File From Server To Client

Mar 4, 2015

I am creating a server that stores application updates. When the client connects the server send the update. The server is sending the file but the file is not complete, i.e, if the file is 317kb,its send 117kb. Below is the code I am using :
 
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class TestFileServer {

[Code] ....

What could the problem be?

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I/O / Streams :: Best Way To Send ArrayList From Server To Client?

Jun 14, 2014

What is the best way to send an arrayList from the server to the client? ObjectInputStream and ObjectOutputStream?

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Communicating Between Client And Server Sockets In Java

Apr 3, 2014

I'm working on an assignment right now which involves passing a variable series of numbers to the Server to be sorted into the correct order and returned to the client.

So far I have it connecting to the server and asking for my numbers, and I am entering each number and pressing return, and it is accepting each number individually.

One (smaller I think) problem i'm having is with the client code, specifically the while loop.. I've tried to code it so that when I enter a full stop ('.') the program will stop asking me for more numbers and move on to sending them to the server.. but instead it just crashes giving an error.. heres an example

"Enter a number: 1
Enter a number: 3
Enter a number: 2
Enter a number: 1.
java.lang.NumberFormatException: For input string: "1."
at java.lang.NumberFormatException.forInputString(Num berFormatException.java:65)

[Code] ....

Here's the client code in full

package numberSortprogram;
import java.io.*;
import java.net.ServerSocket;
public class NumSortClient {
public static void main(String[] args) {
InputStreamReader is = new InputStreamReader(System.in);
[Code] ....

The big problem that I have is figuring out how to send the sorted array back to the client..

So, what im trying to get to happen is-

-Client is asked to enter numbers
-Client enters series of numbers into an array
-Array is converted to a string and sent to the server
-String is then split into an array of strings and sorted using compareTo (don't know if this is the best way?)
-Sorted array is sent back to client and displayed.

fyi this is making use of streamsockets..

All of the rest of my code is below:

package numberSortprogram;
import java.io.IOException;
import java.net.*;
import java.util.regex.PatternSyntaxException;
public class NumSortServer {
public static void main(String[] args) {
int serverPort = 4444; // default port
if (args.length == 1 )

[Code] .....

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How To Send Message To Specific Client In Server

Jan 22, 2015

I want to send a message to a specific client in a server. This is my code and what I tried(I have only given you 3 classes in which I believe I have the problem).

TextClient:

import java.io.*;
import java.net.*;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;
public class TextClient {
public TextClient() {

[Code] .....

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