Logs can give usefull informations to troubleshoot your installation. 2FAuth logs are stored in the subfolder

aka the application you are interacting with

I have installed php 5.6 and and php 7.1 on my Ubuntu 16.04
I know with Apache as my web server, I can do
a2enmod php5.6 #to enable php5
a2enmod php7.1 #to enable php7

When I disable php7.1 in Apa...