Why do I get error "ORA-01017: invalid username/password; logon denied" when using the Oracle ODBC driver?

Check that the User and Password attributes for the data source in the odbc.ini file specify a valid Oracle user name and password.

If you're connecting to an Oracle 11g or later, check that the password specified in odbc.ini is the correct case. By default, passwords are case sensitive for new or modified accounts in Oracle 11g+.