If you have a WordPress installation in your free hosting account, whenever you access to your wp-login area you will see a new Authentication Required pop up CAPTCHA window. You will need to read and enter the randomly generated username and password displayed. Correctly. After that you will get access to your WordPress login area. This is to stop spambot networks from trying to access your WordPress with brute force attacks.
If you better prefer not having this login Authentication Required box in your WordPress login area, you should add to your .htaccess file the following code:
<filesmatch "wp-login.php"> Satisfy Any </filesmatch>
This is also applies for Joomla! installations. But if you want to disable the Authentication Required window, you should add this code to your Joomla! .htaccess file inside the administrator folder:
Create a new ticket if you have questions or problems with this issue.