Solution of invalid username / password; login denied error in Oracle Database Foundation

A invalid username/password; CMD must be run as administrator in win7 or win8

1. Enter command under DOS:
SQLPLUS SYS/Password set at installation as SYSDBA

2. Then type the command:
alter user scott account unlock;

When you enter, the words “User has changed” will appear, and you can move on to the next step.  

3. Enter the command:
conn scott/tiger

After entering, an error message (as follows) will appear:

ORA-28001: The password has expired

Change Scott’s password

New password:

4. Enter a new password;  

5. Repeat the new password.  

Finally, there you go!

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