WebException was unhandled by User (The remote name could not be resolved: 'www.google.com')

I am trying to setup the ReCaptcha control in my ASP.NET web form, but got the following exception message: The remote name could not be resolved: 'www.google.com' I need a professional help on how to resolve this, as I have totally followed the step for ASP.NET configuration in this. -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/1gYXIc9.