數據庫連接到ASM實例權限不足

今天啓動數據庫到MOUNT時，報

ORA-00205: error in identifying control file, check alert log for more info

打開ALERT.Log：

ALTER DATABASE   MOUNT
Thu Jul 01 23:01:22 2010
Starting background process ASMB
ASMB started with pid=16, OS id=3644
Thu Jul 01 23:01:23 2010
ORA-00202: control file: '+DGGROUP/study/controlfile/current.257.722711849'
ORA-17503: ksfdopn:2 Failed to open file +DGGROUP/study/controlfile/current.257.722711849
ORA-15001: diskgroup "DGGROUP" does not exist or is not mounted
ORA-15055: unable to connect to ASM instance
ORA-01031: insufficient privileges

Thu Jul 01 23:01:23 2010
ORA-205 signalled during: ALTER DATABASE   MOUNT...

試用ASMCMD，報ORA-01031。

解決方法：

在WINDOWS上，SQLNET.AUTHENTICATION_SERVICES 必須設定爲NTS 才能連接上ASM。ASMCMD同樣成功。