Hi. I've fixed forum recaptcha, and now you can register on forum again. It was due to reCaptcha API changes As for my forum (currently on j2.5): Open php file plugins/captcha/recaptcha/recaptcha.php First changes: from const RECAPTCHA_API_SERVER = "http://api.recaptcha.net"; const RECAPTCHA_API_SECURE_SERVER = "https://www.google.com/recaptcha/api"; const RECAPTCHA_VERIFY_SERVER = "api-verify.recaptcha.net"; to 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 = "www.google.com"; The second changes: from $response = $this->_recaptcha_http_post(self::RECAPTCHA_VERIFY_SERVER, "/verify", to $response = $this->_recaptcha_http_post(self::RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify",