NetBackup HOWTO's

If you are facing a problem in your RMAN backups:

ORA-28001: the password has expired

As stated, your rman user’s password has expired. You should either change the password, and of course change password in every RMAN script as well.

Or you can do something like this:

1. Create a new profile which has no password expiry

2. Alter your rman user to the new profile

sqlplus /as sysdba

CREATE PROFILE rman_PROFILE

LIMIT

PASSWORD_LIFE_TIME UNLIMITED;

alter user rman PROFILE rman_PROFILE;

Now, you can retry your backup.

Reference : http://www.orafaq.com/forum/t/82806/0/