Support

If you see the password prompt come up in the front-end of your site it means that an extension you are using is trying to load static media such as CSS and JavaScript from a folder located under your site's administrator folder. This is a bug in the extension which should be fixed. In the meantime, you can select the “All PHP files” option, thereby allowing access to the static media resources. This is a bit less secure, in the sense that it makes it easier for attackers to identify which version of Joomla and its extensions you are using by directly accessing their static media files and translation files. While not enough to compromise your site directly, it gives the attacker some insight into your site they could exploit for a future attack. We strongly recommend using our .htaccess Maker and its Backend Protection feature to mitigate this security concern.

https://www.akeeba.com/documentation/admin-tools-joomla/admin-pw-protection.html

So, head back to the Administrator Password Protection page in Admin Tools, set the option “Administrator resources to protect” to “All PHP files”, enter your username and password again, click on Apply Password Protection.