LDAP AD config
If you receive any error about not finding any configuration. You might have the PHP LDAP module missing. So make sure the module is installed.
You can find more information here, and check out this other example. from https://bartoc3.wordpress.com/2014/02/11/configurar-glpi-con-active-directory-en-windows-server-2012/comment-page-1/
Only adding that you have a fully functional integration of your AD with GLPI. The problem comes because the synchronization does not happen on periodic basis. It only happens when:
What if we have AD clients who never login. Let say a customer changes the department. Let say, Client Abraham moves from Research Department to Technical Department. You can easily change the group that the customer belongs to. In the other hand you can have a problem when you want to assign a new job for this customer in GLPI on the new department. You changed AD, but GLPI does not changes automatically. The client has not logged in to GLPI, his rights have not been elevated, so in order to use this customer in the new department. You have to manually synchronize with the AD. By the way doing the synchronization every-time when you have a lot of users can be painful.
To make a periodical synchronization happen the only thing that is requires is to create a chronological task that executes let say every 6 hours (the time you want actually). If you are using Linux that is very simple. GLPI comes with a script inside that does the synchronization. So if you are using Linux. Just add a cron task that executes that script.
# crontab -e
This opens the cron scheduler file in edition mode. Here you should add something like this:
* */6 * * * php /path/to/GLPI/scripts/ldap_mass_sync.php
Save and you are done. That is it for today. As I said here you can find some more features of GLPI.