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on windows, I can't connect with : sqlplus / as sysdba and sqlplus sys/<password>@<instance> as sysd

edited Dec 10, 2013 4:55AM in Database Networking (MOSC) 8 commentsAnswered ✓
Windows 2008 and Oracle 11gR2.

How can I connect

1) if I write in sqlnet.ora

SQLNET.AUTHENTICATION_SERVICES = (NONE)

- sqlplus sys/<password>@&lt;instance> as sysdba

is ok

- sqlplus / as sysdba

ERROR:
ORA-01031: insufficient privileges

2) If I write in sqlnet.ora

SQLNET.AUTHENTICATION_SERVICES = (NTS)

- sqlplus sys/<password>@&lt;instance> as sysdba

- sqlplus / as sysdba

ERROR:
ORA-12638: Extraction des prÚfÚrences utilisateur impossible

What can I do

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