Cannot connect to database when running irca.sh

If you get the following error message:

ERROR: Failed to establish database connection due to the following error:
ORA-01017: invalid username/password; logon denied

when trying to run irca.sh to create schemas in SOA backend database it may be because
remote_login_passwordfile parameter is not set. Run the following command from sqlplus:

SQL> alter system set remote_login_passwordfile=EXCLUSIVE scope=spfile;

Restart the database. The script should be able to connect to database now.