**The below recommendations are directed at customers using both LAM and Mapped User Mode**
The new AIX OS update needs to have the VASMU setting explicitly set. That's set in /etc/methods.cfg, with the authonly flag.
That can be set per person, with the command:
chsec -f /etc/security/user -a SYSTEM=VASMU -s
Or vastool / vasd can set it for all user's in the mapped user file if this setting is disabled:
/opt/quest/bin/vastool configure vas vas_auth mapped-user-directory-auth-optional
Then the mapping re-applied with:
Switch over to PAM authentication from LAM authentication.
How to enable AIX to authenticate users via PAM instead of LAM