ProJoomExperts

Very recently google changed the url of recaptcha plugins javascript. That is why recaptcha is not working in joomla websites anymore.

Old recaptcha javascript url was http://api.recaptcha.net/js/recaptcha_ajax.js
Now that link gives an 404 error. New url is http://www.google.com/recaptcha/api/js/recaptcha_ajax.js

All you have to do is edit this file in your joomla website
\plugins\captcha\recaptcha\recaptcha.php

Go to link 22 where you will find this

const RECAPTCHA_API_SERVER = "http://api.recaptcha.net";

Replace this code with the code below

const RECAPTCHA_API_SERVER = "http://www.google.com/recaptcha/api";


and save the file, Recaptcha will start working again.. I hope an update in joomla will fix this.