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for OS authentication for SYSDBA to work on Windows OS, your Windows (domain) user must be a member in the local ORA_DBA group
(direct, and not via another group) and you must have the sqlnet.ora parameter :
sqlnet.authentication_services = (NTS)
configured. An alternative is to use a passwordfile.
For More information see: Note 77665.1 WIN: OS Authentication - CONNECT AS SYSDBA Without a Password
Harm ten Napel