[Samba] force samba 4.12.5 to log failed and succeeding authentication

[karel.de.macil at free.fr]

Hi all,

i'm strugling since a few hours to find what i can do to have some debug 
information in samba on succesfull or unsccessful login attempt.
I'm running the standard bulleye samba deb package.
Systemd is installed and see some thing , but whatever i put in smb.conf

It seems like i can't have access to those information.

i have allready try :

-log level = 1 auth:5 winbind:5
-log level = 5
-log level = 10

neither the ip or the name of successful or unsuccessful login attempt 
appear in any place.
nor in journalctl -u samba-ad-dc nor in any file in /var/log/samba/

can any one help me on this one ?

best regards