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Google has changed their server url

Change
/plugins/captcha/recaptcha//recaptcha.php
line 25 changes from
const RECAPTCHA_API_SECURE_SERVER = "https://api-secure.recaptcha.net";
to
const RECAPTCHA_API_SECURE_SERVER = "https://www.google.com/recaptcha/api";

Should appear as:

const RECAPTCHA_API_SERVER = "http://www.google.com/recaptcha/api";
const RECAPTCHA_API_SECURE_SERVER = "https://www.google.com/recaptcha/api";
const RECAPTCHA_VERIFY_SERVER = "api-verify.recaptcha.net";