Unix PAM users are unable to log in to PaperCut NG/MF
This article refers to the User/Group sync source Unix Standard (PAM, nsswitch etc.).
Is your PAM (Pluggable Authentication Modules) setup configured to deny services by default?
Some Linux/Unix distributions adopt more stringent defaults for unspecified management groups i.e. account, authentication, password and session.
Try editing the
/etc/pam.d/papercut PAM configuration file with appropriate permissions, and adding the following lines:
auth required pam_unix.so account required pam_unix.so
Please note: The module name (pam_unix.so) may be different for your Linux/Unix distribution.
Save the file. Changes should come in to affect immediately.