Error 56 in TCP IP Communication

Hi All,
I am developing Test Cases to Test our Product, I am using TCP IP Communication to communicate the Hardware (Not NI Hardware) where a firmware is running inside. in the test cases i will communicate the firmware and request it to give me required information in a specified format, it will in response will give the required information. So as I have test cases, I will be opening and closing the port for each test case. till here every thing is going well, but after some test cases are executed I an getting a error 56 while i am trying to open the port.
I am using TCP Listen VI form TCP/IP Pallet; I am sure that not because of Firewall issue.
Please suggest me what could be the reason and solution for it
Thanks and Regards,
Phani.

Why are you using TCP Listen in your code? This is used when you are writing a server that will accept connections from remote devices. From your description it sounds like you need to open a connection to the remote device. Also, can you post your code or example code that shows when you get the timeout error (error 56 = timeout). Generally you get a timeout error when you are writing (rare) or reading from a connection. You can also get a timeout when opening a connection. If you are getting the timeout on a read are you reading the data correctly? That is, generally the data will be a fixed format and you will know how many bytes you need to read. The data may also be written to include the amount of data which is being sent. Or a very common method for simple devices is to use a termination character to mark the end of the data. You need to know how your data should be received and use the correct method for reading the data. If you simply specify to read 1024 bytes but the device only sends you 50 you will timeout. You would have to look at the data to see if you received the complete response.
If you are truly using TCP Listen you may be sitting there waiting for someone to talk to you but the device is nevers trying to connect. As mentioned earlier you may need to use TCP Open instead to establish the conenction with the device.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

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TCP/IP communication with remote host

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CommunicationAgent commAgent;
commAgent= new TCPIPCommAgent();
writer = commAgent.getWriter("CASS");
/* Send GC request message to CASS */
writer.print(searchduedateRequestMsg);
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reader = commAgent.getReader("CASS");
/* Read response message */
String respMsg = reader.readLine();
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System.out.println("Search due date Response from CASS is:" +respMsg);
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and here is my class responsible for TCP/IP communication:
* Created on Jul 15, 2004
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
package com.prtc.commif.framework;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Properties;
import com.prtc.commif.framework.interfaces.CommunicationAgent;
import com.prtc.commif.util.InputResources;
* @author spolireddy
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
public class TCPIPCommAgent implements CommunicationAgent
public BufferedReader getReader(String system)
InputResources inputResources = new InputResources();
Properties props=inputResources.getProperties(system + ".properties");
Socket socket=null;
BufferedReader in=null;
//Get this from the properties
String hostName = "113.132.192.21";
//Get this from the properties
int port = 10103;
try
socket = new Socket(hostName, port);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
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Properties props=inputResources.getProperties(system + ".properties");
Socket socket=null;
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String hostName = "113.132.192.21";
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|Short Text                                                                                        |
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|    Consult your SAP administrator.                                                               |
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|    Pointer    = "000007DD348F6138"                                                               |
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Error 56 in TCP IP Communication

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