Troubleshooting PAM issues

Check if PAM is throwing any issues:


tail -f /var/log/secure

authentication should be successful = your PAM integration/authentication works

Access denied = You authentication successfull but dont have the necessary access rights.

Check the authentication module configuration:
i.e. /etc/sssd/sssd.conf

authentication module logs:

i.e. /var/log/sssd/*.log


Check permissions to service config file. should be 660. I.e.:
chmod mariadb:mariadb /etc/pam.d/MariaDB


Make sure the correct PAM modules are installed (you never know...)

Check of group policies (ad_gpo_access_control) are to be set or not (/var/log/sssd/*.log) and man sssd-ad