ident authentication in fedora core 6

im facing problems with the following code..
initially the jdbc driver was not getting
registered...that problem is rectified...now im facing
problems connecting with the database..

******************************************************import
java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;


public class Example1 {
  public static void main(String[] argv) {
  System.out.println("Checking if Driver is registered
with DriverManager.");

  try {
    Class.forName("org.postgresql.Driver");
  } catch (ClassNotFoundException cnfe) {
    System.out.println("Couldn't find the driver!");
    System.out.println("Let's print a stack trace, and
exit.");
    cnfe.printStackTrace();
    System.exit(1);
  }

  System.out.println("Registered the driver ok, so
let's make a connection.");

  Connection c = null;

  try {
    // The second and third arguments are the username
and password,
    // respectively. They should be whatever is
necessary to connect
    // to the database.
    c =
DriverManager.getConnection("jdbc:postgresql://localhost/ids","postgres","123456");

  } catch (SQLException se) {
    System.out.println("Couldn't connect: print out a
stack trace and exit.");
    se.printStackTrace();
    System.exit(1);
  }

  if (c != null)
    System.out.println("Hooray! We connected to the
database!");
  else
    System.out.println("We should never get here.");
  }
}
*****************************************************
*****************************************************


The error that im geting is

*****************************************************
Checking if Driver is registered with DriverManager.
Registered the driver ok, so let's make a connection.
Couldn't connect: print out a stack trace and exit.
org.postgresql.util.PSQLException: A connection error
has occurred: org.postgresql.util.PSQLException:
FATAL: Ident authentication failed for user "postgres"

  at
org.postgresql.jdbc1.AbstractJdbc1Connection.openConnectionV3(AbstractJdbc1Connection.java:337)
  at
org.postgresql.jdbc1.AbstractJdbc1Connection.openConnection(AbstractJdbc1Connection.java:214)
  at org.postgresql.Driver.connect(Driver.java:139)
  at
java.sql.DriverManager.getConnection(libgcj.so.7rh)
  at
java.sql.DriverManager.getConnection(libgcj.so.7rh)
  at Example1.main(Example1.java:27)
******************************************************



kindly help me with this.... my final yr project
is stuck up because of this...

...Parul


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