Port 7 problem

[Kamil Muzylo]

Hello,

I am trying to run simple socket program from Sun's Java Tutorial site but
anytime I try to run it I get Connection Refused error. I tried many
different urls as well as localhost but nothing seemed to work.

Here's the code:

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

public class EchoClient {
public static void main(String[] args) throws IOException {

Socket echoSocket = null;
PrintWriter out = null;
BufferedReader in = null;

try {
echoSocket = new Socket("taranis", 7);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(
echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: taranis.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for "
+ "the connection to: taranis.");
System.exit(1);
}

BufferedReader stdIn = new BufferedReader(
new InputStreamReader(System.in));
String userInput;

while ((userInput = stdIn.readLine()) != null) {
out.println(userInput);
System.out.println("echo: " + in.readLine());
}

out.close();
in.close();
stdIn.close();
echoSocket.close();
}
}

I tried this code on a linux machine with the newest Java installed.

Thanks for your help in advance.

 

[Sudsy]

Kamil Muzylo wrote:

I tried this code on a linux machine with the newest Java installed.

Thanks for your help in advance.

That's because Linux, by default, doesn't have the echo service
enabled. Check your /etc/inetd.conf file. To enable, remove the
# at the beginning of the two lines beginning with #echo and
follow the instructions in the file, namely 'killall -HUP inetd'.

 

[Cyril Mrazek]

Hi,
I know nothing about Linux machines, but on a Windows one you should
add your taranis host and its corresponding address into the hosts
file in the system32/drivers/etc directory.

CM

 

[Tony Morris]

Kamil Muzylo wrote:


That's because Linux, by default, doesn't have the echo service
enabled. Check your /etc/inetd.conf file. To enable, remove the
# at the beginning of the two lines beginning with #echo and
follow the instructions in the file, namely 'killall -HUP inetd'.

Also, echo is usually on UDP/7 service, you are trying to connect to TCP/7.


--
Tony Morris
(BInfTech, Cert 3 I.T., SCJP[1.4], SCJD)
Software Engineer
IBM Australia - Tivoli Security Software
(2003 VTR1000F)

 

[Sudsy]

Also, echo is usually on UDP/7 service, you are trying to connect to TCP/7.

Tony,
Just for future reference, here's an excerpt from my /etc/inetd.conf
file:

# To re-read this file after changes, just do a 'killall -HUP inetd'
#
#echo stream tcp nowait root internal
#echo dgram udp wait root internal

Many of the basic services are supported by both protocols.

 

[Kamil Muzylo]

Thank you for help.

TCP/7.

Tony,
Just for future reference, here's an excerpt from my /etc/inetd.conf
file:

# To re-read this file after changes, just do a 'killall -HUP inetd'
#
#echo stream tcp nowait root internal
#echo dgram udp wait root internal

Many of the basic services are supported by both protocols.