Some time DNS mignt not update immediately after you made a changes. Here is the step to flush your DNS
For Windows 98 / ME:
- Click Start button, go to run
- Type "winipcfg" and then click OK
- Select your network card name from the adapter drop-down menu
- Click on Release button
- The IP address should display 0.0.0.0. Then click Renew All
- Click OK to close
For Windows XP/2000:
- Click on "Start" button, go to "run"
- Type "command", click "OK"
- Type in "ipconfig /flushdns", then press "Enter"
- Make sure the result is "Successfully flushed the DNS Resolver cache"
- Type "exit" and press "Enter" to close
For Windows Vista:
- Click on "Start" button
- Click "All Programs"
- Click "Accessories"
- Right click at "Command Prompt" and choose "Run as administrator"
- Click "Continue"
- Type in "ipconfig /flushdns", then press "Enter"
- Make sure the result is "Successfully flushed the DNS Resolver cache"
- Type "exit" and press "Enter" to close
