LDAP-UX Client Services B.05.00 with Microsoft Windows Active Directory Server Administrator's Guide (obsolete beyond B.05.00)

Enable PAM logging as described under Section 6.19.2 (page 135) then try logging in again.
Check the PAM logs for any unexpected events.
Enable LDAP-UX logging as described in Section 6.19.1 (page 134), then try logging in again.
Check the log file for any unexpected events.
138 Administering LDAP-UX Client Services