OracleORA-01017

ORA-01017: Invalid Username/Password; Logon Denied

ORA-01017 is the Oracle authentication error. The username or password supplied during connection does not match any account, or the account is locked.

Example Query

-- sqlplus app_user/wrongpassword@mydb

Common Causes

  1. 1Incorrect password or username in the connection string
  2. 2Password case mismatch (Oracle 11g+ passwords are case-sensitive by default)
  3. 3Account locked after too many failed attempts

How to Fix It

Verify the connection credentials. Check account status and unlock: ALTER USER app_user ACCOUNT UNLOCK; IDENTIFY BY new_password;. Note that Oracle passwords are case-sensitive — ensure the connection string preserves the correct case.

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