ORA-01017 Invalid Username/Password when connecting to 11g database from 9i client

February 22, 2023 by Tarik

The user and password are DEFINITELY incorrect.
Oracle 11g credentials are case sensitive.

Try ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGON = FALSE;
and alter password.

http://oracle-base.com/articles/11g/case-sensitive-passwords-11gr1.php