ORA-01017 invalid username/password; logon denied & quot; password

ORA-01017 invalid username/password; logon denied "password loss solution 1. First confirm whether to enter the wrong user name and password www.2cto.com 2. If the password is indeed lost: View sqlnet. ora for SQLNET. AUTHENTICATION_SERVICES = (NONE), which must be changed to SQLNET. AUTHENTICATION_SERVICES = (ETS) execute the following command in SQL * Plus:
SQL> conn/as sysdba (operating system authentication logon)
SQL> alter user system identified by system; (after you press enter, the password of the user system will be changed to system)