Socekt, why socket-connect is broken?

Hi,Dear,
I write a ServerSocket and a client Socket, after client connected to Server,
i find after 7 to 10 seconds, Server check that connect is broken, and client
write data on DataOutputStaream , program throws Exception:
Software caused connect broken, write socket error...
why?
I not set timeout on any side, i use setSoTimeout() ,it seems no usable,i not
close yhe connect also,why ?
any advice is welcom!
thank you !

You can get it done at:
http://www.thesoftwareobjects.com

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Help with an exception when trying to establish a socket connection

i am trying to make a chat (using an applet for the client).......
it uses an simple socket connection between the server and clients.....when i connect the client to address 127.0.0.1 or localhost everything works fine, but when i try to connect the client to my DNS name or ip, i get an exception....the exception reads:
java.security.AccessControlException: access denied (java.net.SocketPermission nextwave.dyndns.org resolve)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:270)
at java.security.AccessController.checkPermission(AccessController.java:401)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:542)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1042)
at java.net.InetAddress.getAllByName0(InetAddress.java:937)
at java.net.InetAddress.getAllByName0(InetAddress.java:918)
at java.net.InetAddress.getAllByName(InetAddress.java:912)
at java.net.InetAddress.getByName(InetAddress.java:832)
at java.net.InetSocketAddress.<init>(InetSocketAddress.java:109)
at java.net.Socket.<init>(Socket.java:119)
at Client.<init>(Client.java:42)
at ClientApplet.init(ClientApplet.java:12)
at sun.applet.AppletPanel.run(AppletPanel.java:347)
at java.lang.Thread.run(Thread.java:536)
what is this all about??????
i'm not that fluent in java, or networking at that, but i'm sure there is something i can do to fix this......
any help would be greatley appreciated.

this is why i am not heart-broken that i will be going the other (executable jar) route.......the major deciding factor is the people who will be using this chat will most likley not be able to edit the policy file due to lack of knowledge, and probably won't want to take the time to try.....they would rather download a program, and double-click execute........
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How can i reuse my existing socket connection

Hi,
this might sound basic, it probably is:
As part of my larger project, i have to send and recieve data to multiple socket connections.
The thing that happens is that everytime i send data, it seems that java is creating a new stream or something (code is multithreaded)
so as i send 4 items of data, a bit like a chat program sending 4 statements, it creates 4 different streams, instead of using the same stream. therefore when i close the connection, i get:
java.net.SocketException: Connection reset 4 times.
i know why.. its because i have added the:
Socket socket=new Socket(host, port);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
bit in the same method with the
out.println(THE DATA....);
out.flush();
The thing what i want to do is to create the connection one, and reuse the objects:
out, in and socket
to send / recieve the new data.
please help me guys,
thanks

All the threads would be able to get the same reference to....
class SocketWrapper {
     private final Object readLock = new Object();
     private final Object writeLock = new Object();
     // client side
    public SocketWrapper(String hostname, int port);
     // server side.
    public SocketWrapper(Socket);
     // send data
     public void send(Serializable object) throws IOException;
     // receive data. synchronized(writeLock);
     public Serializable getNext() throws IOException;
     // create a new socket as required, throw IllegalState if server side. synchronized(readLock)
     private void createNewSocket() throws IllegalStateException;
}The send autoconnects as required. It then send on message/packet/object.
The getNext autoconnects as required. It reads one message/packet/object and returns.
This allows multiple threads to access the same socket. It allows data to be sent while a thread is blocking on a read. (Thus two locks)

Applet socket connection

Hi,
I have an applet that connects to a server java console program through a socket connection which works fine from the command line using appletviewer but doesn't work when running in a html page. The applet is not signed however because the applet and server are running on the same machine it shouldn't need to be. I have used socket connections in applets before and have managed to make the connection to server without having it signed but this one is not working for some reason. I have checked the port is opened and again its the same one I have used before so I know its open.
I am getting the message java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:5000 connect,resolve) when calling:
Socket s = new Socket(ip,port);I also have a java.policy.applet file in the project root directory which has the following in:
grant {
permission java.security.AllPermission;
};Does anyone know a reason why access could be restricted?

Night.Monkey wrote:
Hi,
I have an applet that connects to a server java console program through a socket connection which works fine from the command line using appletviewer but doesn't work when running in a html page. The applet is not signed however because the applet and server are running on the same machine it shouldn't need to be.Wrong. An unsigned applet can only connect back to the server from where it was downloaded. Your applet comes from www.javawebgames.co.uk and tries to connect to 127.0.0.1.
Would your server be at www.javawebgames.co.uk there should be no problem.
I also have a java.policy.applet file in the project root directory which has the following in:
grant {
permission java.security.AllPermission;
};I think this should have zero effect when you are running in the actual browser.

Urgent --- Persistent socket connection?

Hi, I have a question about the persistency of a Java Socket connection. Is it a valid idea to keep a java socket open for a long time? If so, what special care do I need to take?
My Java TCP/IP client runs as a NT service. It keeps getting input messages every few seconds, then send it thru a socket connection to a TCP/IP server. In order to avoid the overhead of opening and closing the socket every time the client gets a message to send, I want to keep the socket connection open and reuse it.
I was able to send hundreds of messages thru this way, then after a while, for no apparent reason,
the socket stops working, I typically get an exception like this:
java.net.SocketException: Connection Shutdown: JVM_recv in socket input stream read
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.read (SocketInputStream.java:90)
at java.net.SocketInputStream.read (SocketInputStream.java:71)
at java.io.InputStreamReader.fill (InputStreamReader.java:163)
at java.io.InputStreamReader.read (InputStreamReader.java:239)
at java.io.BufferedReader.fill (BufferedReader.java:137)
at java.io.BufferedReader.readLine (BufferedReader.java, Compiled Code)
at java.io.BufferedReader.readLine (BufferedReader.java:329)
My programs runs on NT4.0, single-threaded. Any input would be greatly appreciated.

Is it a valid idea to keep a java socket open for a long time? If so, what
special care do I need to take?Depends.
First why keep it open? Your messages only arrive every couple of seconds, does opening/closing the connection take longer than that?
If you must then the complication you must deal with is that your code must deal with re-establishing the connection when it does fail. Opening/closing it every time avoids that issue. The connection will fail, because computers fail, networks fail and people make mistakes. Which doesn't mean that you shouldn't but merely that you should consider the implications of why you need to keep it open.

Socket connection between Java and C

I want to establish socket connection between Java client and C server (on Unix). Can anybody tell how to do it? Will the socket created in client be available in server. I tried out but there was no response from the server.

We too can't connect the daemon server written by "c". The phenomena is below.
<< Execution of this Question1.class >> ---------------------------------------
[kazuyuki@CryptOne tmp]$ java Question1 E 1.2.3.4 MFrame.java 195.211.1.1 15021
<< Output message >> ----------------------------------------------------------
Quetion1 : flg_ = E
Quetion1 : key_ = 1.2.3.4
Quetion1 : fn_ = MFrame.java
Quetion1 : adr_ = CryptOne.localhost/195.211.1.1
Quetion1 : port_ = 15021
java.net.ConnectException: Connection refused
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:350)
     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:137)
     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:124)
     at java.net.Socket.<init>(Socket.java:268)
     at java.net.Socket.<init>(Socket.java:122)
     at Question1.UPLOAD(Question1.java:65)
     at Question1.main(Question1.java:155)
<< Question >> ----------------------------------------------------------------
Why the event "java.net.ConnectException: Connection refused" has occured ?
The server to connect from Question1 can accept the connection request from
the client program coded by "c" program. We have written down the daemon server
program by "c" code tcp/ip socket functions (socket, bind, listen, accept).
Security manager admits the access from this Question1.class, we have checked.
Would you like please answer this Connction refuse occurrence ?
                                                                 2002.05.18 11:50:00.0(JST)
                                                                 K.Masuda
<< Java client code>> -------------------------------------------------
     (c)Copyright     All rights reserved.
          K.Masuda     2002.05.18
               << Question1.java >>
import     java.lang.String;
import     java.io.InputStream;
import     java.io.OutputStream;
import     java.io.DataInputStream;
import     java.io.DataOutputStream;
import     java.io.FileInputStream;
import     java.io.FileOutputStream;
import     java.io.IOException;
import     java.io.FileNotFoundException;
import     java.net.Socket;
import     java.net.InetAddress;
import     java.net.UnknownHostException;
import     java.net.ConnectException;
import     java.net.NoRouteToHostException;
class Question1 {
     char               flg_;
     String               key_;
     String               fn_;
     InetAddress          adr_;
     int                    port_;
     Socket               sock_;
     Question1(
          char          flg,
          String          key,
          String          fn,
          String          adr,
          int               port
          flg_     = flg;
          key_     = key;
          fn_          = fn;
          try{
               adr_     = InetAddress.getByName( adr );
          catch( UnknownHostException e ){
               e.printStackTrace();
          port_     = port;
System.out.println( "Quetion1 : flg_ = " + flg_ );
System.out.println( "Quetion1 : key_ = " + key_ );
System.out.println( "Quetion1 : fn_ = " + fn_ );
System.out.println( "Quetion1 : adr_ = " + adr_ );
System.out.println( "Quetion1 : port_ = " + port_ );
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          try{
               sock_     = new Socket( adr_, port_ );
               UpLoad();
               DnLoad();
               sock_.close();
          catch( UnknownHostException e ){
               e.printStackTrace();
          catch( ConnectException e ){
               e.printStackTrace();
          catch( NoRouteToHostException e ){
               e.printStackTrace();
          catch( IOException e ){
               e.printStackTrace();
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          byte[]                         buf          = new byte[ 512 ];
          int                              rlen;
          int                              wlen;
          try {
               OutputStream          sos          = sock_.getOutputStream();
               FileInputStream          fis          = new FileInputStream( fn_ );
               DataInputStream          dis          = new DataInputStream( fis );
               DataOutputStream     dos          = new DataOutputStream( sos );
               while( ( rlen =     dis.read( buf, 0, buf.length ) ) >= 0 ){
                    dos.write( buf, 0, rlen );
               dis.close();
               dos.close();
               fis.close();
               sos.close();
          catch( IOException e ){
               e.printStackTrace();
     public void DnLoad(
          byte[]                         buf          = new byte[ 512 ];
          int                              rlen;
          int                              wlen;
          try {
               InputStream               sis          = sock_.getInputStream();
               FileOutputStream     fos          = new FileOutputStream( fn_ + ".cry" );
               DataInputStream          dis          = new DataInputStream( sis );
               DataOutputStream     dos          = new DataOutputStream( fos );
               while( ( rlen =     dis.read( buf, 0, buf.length ) ) >= 0 ){
                    dos.write( buf, 0, rlen );
               dis.close();
               dos.close();
               fos.close();
               sis.close();
          catch( IOException e ){
               e.printStackTrace();
     public static void main(
          String[] args
          char[]     chrs     = ( new String( args[ 0 ] ) ).toCharArray();
          Question1     clnt     = new Question1(
                                                                 // E or D
                                        chrs[ 0 ],
                                        args[ 1 ],               // key string
                                        args[ 2 ],               // file to be processed
                                        args[ 3 ],               // IP address
                                                                 // port
                                        Integer.parseInt( args[ 4 ] )
          clnt.UPLOAD();
}

Persistent socket connection - socket write error

I'm connecting to a server using sockets. My application acts like a client, sending requests, and also like a server, listenning for notifications. I was using a client socket for the first task (send a message when required) and a server socket for the second (permanently listen for incoming messages). This needs to be some kind of persistent connection.
It happens now I'm required to send and receive using the same port. The only way I found to do this is to have a single socket (client) bound to a certain port. It connects to the server and one thread keeps listenning for incoming messages (by reading the input stream) while another process is launched whenever I need to send a message (by writing to the socket's output stream). The socket is created only once (when the application starts) and its output/input streams reused whenever needed.
This works well for a while. However, when I try to send a message after some idle time (lets say 20 minutes) strange things happen. The first attempt to send a message returns success (although nothing is actually received by the server). The second attempt returns java.net.SocketException: Software caused connection abort: socket write error. I don't understand this behaviour. Can there be a timeout? I only write to the socket after testing if it's connected.. So why is this failing? Also, any other ideas on how to send and receive using the same port? A different and better approach maybe..
Thanks in advance

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You should certainly issue periodic application 'pings' at suitable intervals, and many application protocols do this. For example, Java RMI reuses connections that are less than 15 seconds old but only if they pass a ping test.
In general however you can't insist on a persistent connection over TCP/IP, especially if you have this kind of hardware in the circuit. What you can do is recognize when the connection has been lost and form a new one. The network is going to fail somewhere some time and your program has to be robust against that.

Excessive cxs socket connections created for ejb access

We are seeing a large number of TCP connections being created to the cxs engine for ejb access in our application.
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However, my question is why are there an increasing number of socket connections? We are caching the ejb instances in the singleton so we should not be creating a large pool of EJBs. I have verfied the large number of sockets using netstat and also using RMI runtime logging in the kjs engine.
Does anyone have any ideas what could be happening here?
Thanks,
Mark

I noticed that most of the TCP connections are made to port 32787. Can anyone from iPlanet tell me what is listening on this port? The large number of socket connections is really tying up server resources.
Thanks,
Mark

JPanel doesn't get visible when followed by socket connection

Hi all... I'm having a problem with a java Swing application...
when a actionEven is given, I want to create a new socket to connect to a server, and I'd like to show a panel with a "connecting... " message while it's done.
My problem is that writing the code secuentially, it does not work in the correct order
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Thanx 4 answer :) neville
I have the answer allready - just I had to add 1 row in routers properties file, like:
swiftlet.sys$jms.listeners.plainsocket.bindaddress=192.168.0.1
It was in the SwiftMQ documentation, but I was to lazy to read all of it. My fault.
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Secure connection suddenly broken in SGD 4.6 on CentOS?

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The certificate file doesn't exist.
but i verified my files with openssl commands, and they are ok!
i also noticed this kind of messages that happens often:
Jan 24 22:05:07 nemo kernel: ttaxpe[19381]: segfault at 0000000000000008 rip 00000000080c2d4c rsp 00000000fff54400 error 4
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Can't connect RFCOMM socket: Connection refused

I am trying to use my mobile as bluetooth modem but I am stuck at the initial step.
shadyabhi@archlinux-N210 ~ $ rfcomm connect 0
Can't connect RFCOMM socket: Connection refused
My rfcomm.conf:
rfcomm0 {
# # Automatically bind the device at startup
bind yes;
# # Bluetooth address of the device
device 00:25:47:9F:AA:07;
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Guyz, please help me solve the issue. I have tried googling but no luck. And I already have my laptop as trusted devices in my phone.

i don't know how and why but appeared a new device on my phone called "james1711" and with this my pin is accepted when i type rfcomm connect 0; but after one minute of trying to connect appear another error in the shell:
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Decompile applet and proxify all URL and socket connection and recompile

Hi,
Please anybody have idea for the below.
I need to decomple the applet class file to .java file and need to change all URL and Socket connection to proxify all connections from applet. and recompile the sample applet to make ready to load in browser.
Thi is to load the applet form the web server through one proxy server. In the proxy server side While loading the applet from web server that applet code need to be changed to modify the URL and connections used in that applet to change the further connection from applet through proxyserver.
Compile and decompile is not a problem that i can use javac and javap respectively.
But I want to know how to change all URL and connection in applet. is there any easy way to handle this with out changing the applet code.
can Anybody help me.
Thanks and Regards,
Shiban.

Not sure how you do that:
Client <----[HTTPS]-----> Secure Gateway <------[HTTP]------->Web servers
or
Internet Explorer/Mozilla <----[HTTPS]-----> proxy <------[HTTP]-------> Google
Is the above correct?
If so than what are the proxy settings in IE/Moz, I can specify the proxy address in the
browsers but not the proxy type (SSL).
When you want to visit a page like google I gues you just type http://www.google.com in
the browsers address bar. The browser will figure out how to connect to the proxy.
Java has got the control panel in the general tabl there is a button "network settings...:"
I have it to "use browser settings" and this works for me.
All URL and URLConnections work but the sockets don't (maybe put in a bug report)
for example games.yahoo.com -> card games -> bridge -> create table
In the trace I can see:
network: Connecting http://yog70.games.scd.yahoo.com/yog/y/b/us-t1.ldict with proxy=HTTP @ myproxy/00.00.00.00:80
network: Connecting socket://yog70.games.scd.yahoo.com:11999 with proxy=DIRECT
The second one fails because port 11999 is not open (what idiot uses an unassigned
port for a profesional site is beyond me).
http://www.iana.org/assignments/port-numbers
# 11968-11999 Unassiged
Even if the port was open on the proxy you'll notice with proxy=DIRECT that
"use browser settings" does not work with socket (bug report??).
Anyway my advice is to open the java console (windows control panel or javacpl.exe in
the bin dir of java.home) and make sure it is set to "use browser settings"
Then enable a full trace:
To turn the full trace on (windows) you can start the java console, to be found here:
C:\Program Files\Java\j2re1.4...\bin\jpicpl32.exe
In the advanced tab you can fill in something for runtime parameters fill in this:
-Djavaplugin.trace=true -Djavaplugin.trace.option=basic|net|security|ext|liveconnect
if you cannot start the java console check here:
C:\Documents and Settings\userName\Application Data\Sun\Java\Deployment\deployment.properties
I think for linux this is somewhere in youruserdir/java (hidden directory)
add or change the following line:
javaplugin.jre.params=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
for 1.5:
deployment.javapi.jre.1.5.0.args=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
The trace is here:
C:\Documents and Settings\your user\Application Data\Sun\Java\Deployment\log\plugin...log
I think for linux this is somewhere in youruserdir/java (hidden directory)
Print out the full trace of the exception:
try{...}catch(Exception e){e.printStackTrace();}
Then visit the games.yahoo and try to create a new table playing bridge.
Inspect the trace and see if it works/why it doesn't work.

Socket.connect

I'm trying to write a client application that will connect to a server whenever it becomes available. There are some problems which I hope someone will be able to help, Below is a snippet of the code that makes the connection:
while(alive){
try{
/* part 1*/
Socket s = new Socket();
s.setReuseAddress(true);
s.bind(localAddress);
/* end part 1*/
s.connect(targetAddress);
} catch (Exception e){}
this seems to works fine. However when I place part 1 of the code outside the while loop. the connection will not be made if the server application is up after my connection thread has started running. Isnt Socket.connect suppose to block until a valid connection is made?
Also when running my application (with the code above) over a long period of time, I get a OutOfMemoryException (native memory) when the server application is not present. Do I have to specify some other parameters for the JVM to release the native resources allocated for a socket construction or is this just a bug? I am running the application using java 1.6 on RHEL4 2.6.9-34.ELSMP.
Thank you in advance.

The thread is respawned when then server application
drops thus yes the socket will only make one
connection.Not if you move part 1 out of the loop.If you do that you will attempt multiple connections with the socket, which doesn't work.
Shouldnt the thread block when .connect() fails?Why? Block doing what?
Instead i'm getting a connection refused exception.What else should it do?
No i did not close the socket when I get an exception.You should.
Should the resources be reclaimed since
the socket object would have gone out of scope?Eventually.
I'm running my application on a system with multiple
network cards thus i need to bind it to the intended
address.Why? TCP/IP will find the best route if you don't get in its way. Why not let it?

Socekt, why socket-connect is broken?

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