In these two tabs you can configure the user-/group providers if you want to use user-/group synchronization with other systems.
You can again choose between a database table and a LDAP system as source for the synchronisation process.
For both servers, you need to provide several columns, containing required user information:
Testing
You can test your database/LDAP connection before activating it.
Fill out all fields and click on the 
button in the upper right corner.
Don't forget to save your settings with 
.