[android help] java.net.SocketException: Address family not supported by protocol in android emulator

I am trying to run simple application to access internet from android emulator and here is my code. I am behind proxy and configured proxy settings in emulator by"...Wireless Networks -> APN -> ..." . But internet is working from browser and not from application.

            HttpURLConnection connection = null;
    String URLName = "http://www.google.com";

    try {
        URL u = new URL(URLName);
        connection = (HttpURLConnection) u.openConnection();
        connection.setRequestMethod("HEAD");
        int code = connection.getResponseCode();
        Log.d(TAG1, " " + code);
        // You can determine on HTTP return code received. 200 is success.
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        Log.d(TAG1, e.toString());
    }

    finally {
        if (connection != null) {
            connection.disconnect();
        }
    }

The part of error log in Logcat is as follows:

01-11 01:01:26.308: DEBUG/SntpClient(72): request time failed: java.net.SocketException: Address family not supported by protocol

01-11 01:02:39.909: WARN/System.err(422): java.net.SocketException: The operation timed out

I tried the following options after searching in forum but none of them seems working:

1. 
   

   In android launch options I used -http-proxy server:port -dns-server server

   
   


2. 
   

   I have included internet permissions in manifest file

   
   

   uses-permission android:name="android.permission.INTERNET"

   
   

   uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"

   
   


3. 
   

   Set the system properties to use ipv4 stack after someone suggested

   
   

   
           java.lang.System.setProperty("java.net.preferIPv4Stack", "true");
   java.lang.System.setProperty("java.net.preferIPv6Addresses", "false");
   
   

I am working on Android 2.2 and windows vista, can you please help me here...

.

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