Oracle 11g logon Password

Possible causes include:
1. If you log on as a sys user, select as sysdba as the connection identity]
NOTE: If your sys user password is not modified during installation, the default password is:
[Change_on_install ].
If you forget it, You can reset it as follows:
1) Go to cmd
2) sqlplus/As sysdba
3) alter user SYS identified by new password;

2. If you have created a new normal user login, please confirm the user name and password again. If it is not confirmed, use the sqlplus tool to recreate a user and try again as follows

1) Go to cmd
2) sqlplus/As sysdba or sqlplus sys/password as sysdba
3) create user username identified by password;
4) grant connect, resource to user name;
5) Conn user name/Password
Note: If the connection is successful in step 5th, the user can log on to the system by setting up the connection.