3004-303 There have been too many unsuccessful login attempts; please see the system administrator
If your user can’t login and is receiving this error message, you need to reset his unsuccessful login attemps in the user’s account.
Check his unsuccessful login counter with lsuser
root@aix:/ # /usr/sbin/lsuser -a unsuccessful_login_count <username>
Then reset the counter with chsec
root@aix:/ # /usr/bin/chsec -f /etc/security/lastlog -a unsuccessful_login_count=0 -s <username>