SQL Developer can't connect Oracle Database as SYSDBA

Dear all,
Recently,I installed SQL Developer3.0 on my machine,and try to create connection to local oracle database.But one problem confused me.When i login as normal role ,it can connect DB successfully; when i login as sysdba role named sys,it always failed and show" invalid username/password".I am sure the username and password are right ,because i haved connected the oracle DB by pl/SQL with the same username and password. And i also choosed the role as sysdba. Does SQL Developer3.0 not support connect as sysdba? I would very appreciate if someone could give me a hand .Thanks in advance.

Hi 851634,
Do you require a password file for remote sysdba (old link)?
Cannot login as sysdba in Oracle Enterprise Management Console
You may be trying to log in (loopback) over the network as sysdba which needs a password file.
-Turloch
SQLDeveloper team

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Go to System Administration
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http://help.sap.com/saphelp_nw04/helpdata/en/84/d5df3df2ad685ae10000000a11405a/frameset.htm
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LSNRCTL for 64-bit Windows: Version 11.2.0.2.0 - Production on 03-DIC-2012 04:46
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Copyright (c) 1991, 2010, Oracle. All rights reserved.
Avvio di tnslsnr: attendere...
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STATO del LISTENER
Alias listener
Versione TNSLSNR for 64-bit Windows: Version 11.2.0.2.0 - Produ
ction
Data di inizio 03-DIC-2012 04:46:20
Tempo di attivitÓ 0 giorni 0 ore 0 min. 5 sec.
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Sicurezza ON: Local OS Authentication
SNMP OFF
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dmin\listener.ora
File di log listener C:\app\Administrator\diag\tnslsnr\WIN-77CAQGHJSA2\list
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(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521)))
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LSNRCTL for 64-bit Windows: Version 11.2.0.2.0 - Production on 03-DIC-2012 04:46
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Copyright (c) 1991, 2010, Oracle. All rights reserved.
Avvio di tnslsnr: attendere...
TNSLSNR for 64-bit Windows: Version 11.2.0.2.0 - Production
Il file dei parametri di sistema Þ C:\app\Administrator\product\11.2.0\dbhome_1\
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Messaggi di log registrati in D:\product\11.2.0\tg_2\diag\tnslsnr\WIN-77CAQGHJSA
2\listener1\alert\log.xml
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STATO del LISTENER
Alias listener1
Versione TNSLSNR for 64-bit Windows: Version 11.2.0.2.0 - Produ
ction
Data di inizio 03-DIC-2012 04:46:29
Tempo di attivitÓ 0 giorni 0 ore 0 min. 5 sec.
Livello trace off
Sicurezza ON: Local OS Authentication
SNMP OFF
File di parametri listenerC:\app\Administrator\product\11.2.0\dbhome_1\network\a
dmin\listener.ora
File di log listener D:\product\11.2.0\tg_2\diag\tnslsnr\WIN-77CAQGHJSA2\li
stener1\alert\log.xml
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Summary table dei servizi...
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SQL*Plus: Release 11.2.0.2.0 Production on Lun Dic 3 04:46:34 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
SQL> conn system/Manager1@star
Connesso.
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select count(*) from prefer@test2
ERRORE alla riga 1:
ORA-28545: errore diagnosticato da Net8 durante la connessione a un agente
Unable to retrieve text of NETWORK/NCR message 65535
ORA-02063: precedente 2 lines da TEST2
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TNS Ping Utility for 64-bit Windows: Version 11.2.0.2.0 - Production on 03-DIC-2
012 05:01:28
Copyright (c) 1997, 2010, Oracle. All rights reserved.
File di parametri utilizzati:
C:\app\Administrator\product\11.2.0\dbhome_1\network\admin\sqlnet.ora
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Tentativo di contattare (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1522)) (CONNECT_DATA = (SERVICE_NAME = dg4msql)) (HS=OK))
OK (0 msec)
tnsnames.ora file at D:\product\11.2.0\tg_2\NETWORK\ADMIN
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(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1522))
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(HS=OK)
C:\app\Administrator\product\11.2.0\dbhome_1\NETWORK\ADMIN
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(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
dg4msql =
(DESCRIPTION =
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(CONNECT_DATA = (SERVICE_NAME = dg4msql))
(HS=OK)
test=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = test)
)

SQL Developer can't connect Oracle Database as SYSDBA

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