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Someone has an app (Android) that accesses my website and displays some pages.
I would've been ok with it except that the app has some errors and people using it are unable to use certain functionalities of the site.
How can I block this specific app?
P.S. I have root access to my web server and it's dedicated. I run CentOs 7 and using Joomla for my website.
Check your Apache logs for the user agent of that app, and then block that user agent. Hopefully the user agent will be unique so no other apps will be affected.