Exeption on primefaces javax.faces.FacesException: java.net.UnknownHostException: api-verify.recaptcha.net

I've implemented captcha on my primefaces application but a got the next exeption when send my form:INFO|glassfish3.1.1|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=20;_ThreadName=Thread-2;|ERROR [http-thread-pool-4980(3)] (SupportExceptionHandler.java:51) - Serious error happened! javax.faces.FacesException: java.net.UnknownHostException: api-verify.recaptcha.netSomebody knows about this error?. -- 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.