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ORA-01017: Invalid username/password; logon denied
What it means
The credentials were rejected. Since 11g passwords are case-sensitive; the user may also be connecting to the wrong service/PDB, or the password file / OS authentication is not set up.
How to fix it
Check the case of the password, the service name and PDB, and whether the account exists (DBA_USERS). Quote passwords containing special characters. On newer versions also check the client/server authentication protocol (see ORA-28040).
Catch it before it runs
ORA Error Helper
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Explains ORA-/PLS- codes inside JetBrains IDEs and DataGrip. PL/SQL Lint
Flags risky PL/SQL patterns while you type. Oracle Plan Reader
Reads execution plans and points at the slow step. PL/SQL in Practice
Kindle book with practical PL/SQL for working developers.
Nearby errors
Updated 2026-11-12.