Call to DB and Files outside the Public Folder

Dear CodeIgniter Community, First post, Yay ! 

Need some help.


We are using Code-Igniter as the base frame for our website (custom tailored). The way it's programmed, we can call from the website to some files and databases that are stored outside the public folder (for security reasons), we had a domain/server transition few days back, and currently the website is broken because it's not allowing us to those calls (system_path). 
I'm wondering if you may point us in the right direction of what to double check or test.

Thanks in advance