I spent the last 2 hours trying to figure out why I was getting prompted when I SU’d from root to another ID.
In the /etc/security/login.cfg, the authentication was set to PAM_AUTH instead of STD_AUTH.
Quick change and PRESTO! I now can SU to an ID from root without being prompted for the user’s password.
Note: this may be specific to AIX 5.3 with the build I have use of at work. There are other authentication options, PAM configurations, and 3rd party applications in play.
