ORA-1017: invalid username/password; logon denied - coming from an oracle application form (IAS)

Almost sure the problem is inside of the database.
Just follow this:


sqlplus / as sysdba
alter system set sec_case_sensitive_logon=false scope=both;
exit
orapwd file=/opt/oracle/db/dbs/orapw$ORACLE_SID password=pass ignorecase=y

If the problem will persist, let me know!