Java Database Connectivity (JDBC)

hi,I've a java program that connects to a sql server database using jtds 1.2.the client box(which is a winxp box) is in the same domain as the server box.Here is the code (hope it will be readable):

public class Main {

    public static void main(String[] args) {
        try {          
            Class.forName("net.sourceforge.jtds.jdbc.Driver");
            
            String connectionUrl = "jdbc:jtds:sqlserver://192.168.1.82:1433/pubs;namedPipe=true";
            String user = "sa";
            String pass = "test";
            Connection con = DriverManager.getConnection(connectionUrl, user, pass);
            
            String SQL = "select * from authors";
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery(SQL);
            while (rs.next()) {
               System.out.println(rs.getString("au_lname") + ", " + rs.getString("au_fname"));
            } 
            rs.close();
            stmt.close();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }        
    }    
}

This program works correctly.But when i switch to a linux box (not in the server 's domain),i get the following error:

java.sql.SQLException: Network error IOException: Logon failure: unknown user name or bad password.
        at net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:372)
        at net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50)
        at net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:178)
        at java.sql.DriverManager.getConnection(DriverManager.java:548)
        at java.sql.DriverManager.getConnection(DriverManager.java:179)
        at usingsqlserverfromjava.Main.main(Main.java:40)
Caused by: jcifs.smb.SmbAuthException: Logon failure: unknown user name or bad password.
        at jcifs.smb.SmbTransport.send(SmbTransport.java:689)
        at jcifs.smb.SmbSession.sessionSetup(SmbSession.java:271)
        at jcifs.smb.SmbSession.send(SmbSession.java:228)
        at jcifs.smb.SmbTree.treeConnect(SmbTree.java:134)
        at jcifs.smb.SmbFile.connect(SmbFile.java:827)
        at jcifs.smb.SmbFile.connect0(SmbFile.java:797)
        at jcifs.smb.SmbFile.open0(SmbFile.java:852)
        at jcifs.smb.SmbFile.open(SmbFile.java:881)
        at jcifs.smb.SmbFileOutputStream.<init>(SmbFileOutputStream.java:139)
        at jcifs.smb.SmbNamedPipe.getNamedPipeOutputStream(SmbNamedPipe.java:189)
        at net.sourceforge.jtds.jdbc.SharedNamedPipe.<init>(SharedNamedPipe.java:76)
        at net.sourceforge.jtds.jdbc.ConnectionJDBC2.createNamedPipe(ConnectionJDBC2.java:459)
        at net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:294)
        ... 5 more

What is the problem,and how can i resolve it?
thanks.

By the way,this program doesn't work(both on winxp and linux) if i don't use "namedPipe=true"(connection refused).