Force All Application users to Change their password

This is available starting in RUP4.
Requires Patch 4676589 ATG RUP 4.
The script to expire all passwords in the fnd_user table is $FND_TOP/patch/115/sql/AFCPEXPIRE.sql.
It can be executed from SQL*Plus or as a Concurrent Program: sqlplus -s APPS/ @AFCPEXPIRE.sql
or Submit concurrent request: CP SQL*Plus Expire FND_USER Passwords
This script sets the fnd_user.password_date to null for all users which causes all user passwords to expire. It can also be run as a SQL*Plus concurrent program.
The user will need to create a new password upon the next login.

Happy Troubleshooting !!!