Binary Socket Connection Interruption? bytes lost?

Hi,
I am starting with a short introduction: I am currently working on a project, which involves a server application written in .NET (C#) and a flash gui app as client (standalone flash player 10 [code is written in Actionscript 3.0]). The server constantly sends bitmaps to the client (up to 30fps). The connection is established using binary sockets and data ist streamed to avoid socket open/close/reconnection problems.
The bitmaps sent to the client are marked with begin- and end-tags. A length field was added as well, to optimise the following parsing process. The client buffers the received data up to the point where an end-tag is found. The client reassambles the bitmaps on the screen by parsing the current buffer. Parsing means looking for begin-tags and length fields and/or end-tags of pictures packages. The resulting bitmap data is copied into a byte array and will loaded into a movieclip using the flash.display.Loader class ( bytePictureLoader.loadBytes( byteArray ); ).
Basically looks/works like this:
[SERVER]--->[BEGIN-TAG][LENGTH][BITMAPDATA][END-TAG]-[BEGIN-TAG][LENGTH][BITMAPDATA][END-T AG]-...--->[CLIENT]
While testing, I found out that in some cases the data stream becomes currupted, i.e. data is lost and/or the transmittion is incomplete.
A good thing is that this error is reproducable.
It seems that as soon as the Flash Application Window is dragged (moved on Windows Desktop) the stream lacks data.
The same error occurs, if too much data is sent to the client. The results are performance problems, data loss and other strange effects. The more data is sent on the stream, the more data has to be parsed and the more data gets lost somehow. Sometimes this leads to a memory problem, because Begin- and End-Tags aren't transmitted correctly. In order to fix (counteract) that, I discard data as long as there is no Begin-tag found and the buffer is cleared when the size exceeds 1Mb.
It works so far, but the application lacks performance and stability.
I.e. If 20 bitmaps per second with 620x390px are sent to the client, the client only receives 16 to 17 bitmaps, if the application does nothing else.
If 30 bitmaps per second with 620x390px are sent to the client, the client only receives about 20 to 21 bitmaps.
I am wondering, if there is actually a better solution the solve this problem.
I am guessing that using actuall video streams would be better, then sending one bitmap at a time in a byte stream.
Is there a proper example on how to build a client app in flash to receive/parse a binary data stream??
Does anyone else has recognized the lost-data problem or the interruption of streams?? And is there a solution to this problem?
thanks a lot for your attention hope you can help me out here!
cu
Tobi

Hi Hakan,
thx, but this doesn't work. I think flash struggels with the amount of data to parse. I tested sending images twice, but now i receive only 9 to 12 bitmaps out of 25 bitmaps sent.
Strange thing is, the problem only occurs if the flash player is maximised. As soon as I minimize the flash player window, the parsing works fine, but the image is not being loaded. Guess that's a performance feature of the flash player to not render actuall screen elements as long as the windows window of the flash player is not visible.

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I have an issue with a college project I'm working on.
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So then, I tried something different: Have the program turn the "msg" string variable, into a "sentnumber" number variable. This seemed to work nicely, tracing a NaN for text (expected), or tracing the number of an actual number.
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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
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<< Question >> ----------------------------------------------------------------
Why the event "java.net.ConnectException: Connection refused" has occured ?
The server to connect from Question1 can accept the connection request from
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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 {
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     String               key_;
     String               fn_;
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     int                    port_;
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          String          fn,
          String          adr,
          int               port
          flg_     = flg;
          key_     = key;
          fn_          = fn;
          try{
               adr_     = InetAddress.getByName( adr );
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System.out.println( "Quetion1 : key_ = " + key_ );
System.out.println( "Quetion1 : fn_ = " + fn_ );
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System.out.println( "Quetion1 : port_ = " + port_ );
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          int                              rlen;
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          byte[]                         buf          = new byte[ 512 ];
          int                              rlen;
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          Question1     clnt     = new Question1(
                                                                 // E or D
                                        chrs[ 0 ],
                                        args[ 1 ],               // key string
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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

Socket.isConnected just tells you whether you have personally called Socket.connect() or new Socket(host, port,...). It doesn't tell you anything about the state of the connection.
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.

Problem: Socket connection is not creating in machine, through utility program (MFC Dll), on ListDisplay service port - 3334 (on separate machine), while we are able to telnet on same ListDisplay service port - 3334 from same issue machine on same time

Problem: Socket
connection is not creating in machine, through utility program (MFC Dll), on ListDisplay service port - 3334 (on separate machine), while we are able to telnet on same ListDisplay service port - 3334 from same issue machine on same time
Environment: -
OS:
Windows XP SP2/7
Code:
VC 6.0
Dll: MFC
Problem Description: -
We have written a utility program which create socket (Using windows standard method [MFC]), and then make connection with another service (List Display) running
on port 3334 in different machine and retrieve the required list data. This program was working fine in almost all the machines.
But, we have received a severe intermittent issue on two machines. Client is facing issue in displaying the list data from port 3334.
Attempt: -
First we tried to debug code, and we come to know that socket is not creating in utility program. So we tried to telnet on ListDisplay service port 3334 and we were surprised that we were able to telnet, then we opened some more
telnet window on same port 3334 around (6 to 8) window, and each cmd connected properly. But we were not able to create socket from utility program.
Problem is severe because issue is intermittent.
We have tried all the way, but we are not able to figure it out, that what can be the exact problem and what are the conditions, when utility program will not
connect with ListDisplay service on port 3334.
Kindly assist to resolve this issue. For any help, we would be really thankful.

Hi,
According to your description, it seems that you have created an utility program which is making connection with another service port 3334, however, two clients are facing issue in display the data list from port 3334.
Port: 3334/TCP
3334/TCP - Known port assignments (1 record found)
Service
Details
Source
directv-web
Direct TV Webcasting
IANA
Since the port 3334 is used by directv-web service, I'd like to suggest check this service it is working well on the problematic clients.
1. The client can be resolved in DNS well? Please run "nslookup" in the prompt command.
2. Is there any 3rd party application interrupting? Do test in clean boot.
2. Strongly suggest you run process monitor tool to analysis it.
I am looking forward to your reply if you have any updated on your side.
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Integration Directory - Server Connection interrupted

Hi,
after a system copy we have the following problem: If we start the "Integration Builder:Configuration" and want to view, create or change an object we lost the server connection. The error message in a popup is: "Connection Interrupted. Connection to sercer lost. You can log again once the server is available again. Do you want to log on again?" After the log on again and a new click of an object to view or change it, the same error pops up.
What can i do?
Kind regards, Norbert

Hi,
the problem exists only in the integration directory. In "Integration Builder: Design (Integration repository)" there are no problems with viewing and changing objects. Also my user login is not locked due to invalid login attempts.

Server connections interrupted??

I've tried to get the proper forum, sorry if wrong.
I was surfing on my macbook air when all of a sudden I get this 'pop-up' that looks like an Alert(?): A yellow triangle with an exclamation mark in it and it says: "Server Connections Interrupted" and below a picture of maybe a light blue 'book' with three white 'men' (figures) in it and next to it it said 'SharedDocs' and under that 'Owner', then I had the option of clicking either: 'Ignore' or 'Disconnect All' and lastly a 'eject' type of symbol
But I never lost service, was I being hacked???I have a secure wi-fi
I clicked the 'eject' type 'thing' and it went away....
signed nervous

I may be having this problem on my server. I have leopard on the router and tiger still on AFP on the internal server until I get time to upgrade. But I am not actually losing the connection. It just says that it is interrupted. This has gotten much worse lately.

Binary Socket Connection Interruption? bytes lost?

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