我把我的blog的东西给你贴出来吧，参考下。
不翻译了，自己慢慢看。
复制内容到剪贴板
代码:
CONN / AS SYSDBA give ORA-01031
In windows, If you have such error:
SQL> conn / as sysdba
ERROR:
ORA-01031: insufficient privileges
Check the sqlnet.ora first
SQLNET.AUTHENTICATION_SERVICES = (NTS)
This allows any privileged user defined in the NT user group (named ORA_<sid>_DBA or ORA_DBA) to login to database without providing a password.
To disable this, comment this line or change it to:
SQLNET.AUTHENTICATION_SERVICES = (NONE)
After solve this issue, open a new sqlplusw, you should able to see:
SQL> conn / as sysdba
Connected.
SQL>
Remarks: Following information can be found in the Application log with event viewer.
Event Type: Information
Event Source: Oracle.orcl
Event Category: None
Event ID: 34
Date: 8/8/2005
Time: 3:44:31 PM
User: N/A
Computer: AIX
Description:
The description for Event ID ( 34 ) in Source ( Oracle.orcl ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: ACTION : 'CONNECT' DATABASE USER: '/' PRIVILEGE : NONE CLIENT USER: donghua CLIENT TERMINAL: AIX STATUS: 1031 . 
