May 6, 2013

this error tell us that user password has expired. check this with following request:
SELECT USERNAME, PROFILE, ACCOUNT_STATUS, EXPIRY_DATE FROM dba_users WHERE username=’your_oracle_username’;
value of ACCOUNT_STATUS column (expired or expired&locked;)

password policies are defined in oracle PROFILE associated to user (value of PROFILE column). profile properties can be found here:
select * from dba_profiles where profile = ‘profile_name’;

take a look of line : resource_name =’PASSWORD_LIFE_TIME’ and depending on your security policies you can change the value to UNLIMITED to avoid password expiry