Why is the command conn / as sysdba throwing an error in sqlplus?
Enter user-name: conn / as sysdba Enter password: ERROR: ORA-01017: invalid username/password; logon denied
The special string
/ as sysdba tells Oracle to use OS Authentication instead of a username/password. Your OS (looks like Windows) is not authorizing you to connect to Oracle as sysdba.
Make sure your Windows user is a member of the
ORA_DBA local group on that computer.