If you have tried to convert your system to trusted system, or vice-versa, all your users' status have been changed to LOCKED. You need to unlock the users one by one.
Code:
cat /etc/passwd | while read uline; do
UNAME=$(echo $uline | cut -d: -f1)
/usr/lbin/modprpw -l -m alock=NO $UNAME #unlocks the account
/usr/lbin/modprpw -k $UNAME #resets incorrect login count
done
