codice:
import java.net.*;
import java.io.*;

public class EsempioNet1 {
public static void main(String args[]){
Socket s = null;
try {
s = new Socket("localhost",13);
InputStream is = s.getInputStream();
InputStreamReader ir = new InputStreamReader(is);
BufferedReader r = new BufferedReader(ir);
String line = r.readLine();
System.out.println(line);
s.close();
} catch (Exception e){
System.err.println(e);
} }
}
ERRORE: java.net.ConnectException: Connection refused: connect

(server tomcat)

Qualcuno mi sa spiegare il motivo?
GRAZIE E CIAO