UnknownHostException with WLS 8.1

Hello,

I am using WebLogic Server 8.1 under RedHat Linux 9.0 and JDK1.4.1_05. I am trying to run the following servlet:

package smswebapp;

import java.io.*;
import java.net.MalformedURLException;
import java.net.UnknownHostException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import javax.servlet.*;
import javax.servlet.http.*;

public class SMSServlet extends HttpServlet
{
    // The session ID obtained from the clickatel gateway
    private static String sessionID = null;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
    {
        processRequest(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
    {
        processRequest(request, response);
    }

    /**
    *   Processes the request from the user.
    *
    *   @param  request - The request object
    *   @param  response - The response object
    */
    public void processRequest(HttpServletRequest request, HttpServletResponse response)
    {
   
        try
        {
            System.out.println("setting properties...");
            System.getProperties().put("http.proxySet", "true");
            System.getProperties().put("http.proxyHost", "192.168.6.92");
            System.getProperties().put("http.proxyPort", "8080");

            // Create a URL for the desired page
            URL url = new URL("http://www.yahoo.com");
            System.out.println("URL object created...");
            // Read all the text returned by the server
            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
            System.out.println("input from url obtained...");
            String str;
            while ((str = in.readLine()) != null)
            {
                System.out.println("line: " + str);
            }
            in.close();
        }
        catch (MalformedURLException e)
        {
            System.out.println(e);
        }
        catch (IOException e)
        {
            System.out.println(e);
        }
     }
}

but I am getting an UnknowHostException at this line:

BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));

I am not sure what is going on but the exact same servlet above runs fine under Tomcat 5.0. I guess WLS does not recognize the http proxy settings I am passing, or could it be something else?

Any thoughts and help is appreciated.

Regards