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Invalid user name and password

After installing Oracle9i, I tried logging in as both sys and system user but said invalid user name or password. I was able to login as Scott user. I set the passwords for sys and system during install.
If you can "connect/as sysdba", then you can reset the sys and system passwords. In order to logon as the SYS user, you'll have to invoke the sysdba privilege, but the SYSTEM connection should not require that. I've never seen it fail to set the passwords that you gave the DBCA, so you're in unchartered territory as far as I'm concerned. You may want to check the DBCA log if any was created to see if any errors happened.

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