ORA-17503: ksfdopn:2 Failed to open file ... ORA-01031: insufficient privileges

If use "SQLNET.AUTHENTICATION_SERVICES=(NTS)" on sqlnet.ora, perhaps you will find bellow Errors on alert log.

Tue Dec 23 16:00:45 2008

Unexpected communication failure with ASM instance:

 error 1031 (ORA-01031: insufficient privileges

)

Unexpected communication failure with ASM instance:

 error 1031 (ORA-01031: insufficient privileges

)

Errors in file ORACLE_BASE/diag/rdbms/db/db1/trace/db1_arc0_2089.trc:

ORA-00313: open failed for members of log group 5 of thread 2

ORA-00312: online log 5 thread 2: '+DATA2/db/onlinelog/group_5.394.673269475'

ORA-17503: ksfdopn:2 Failed to open file +DATA2/db/onlinelog/group_5.394.673269475

ORA-01031: insufficient privileges

ORA-00312: online log 5 thread 2: '+DATA1/db/onlinelog/group_5.271.673269473'

ORA-17503: ksfdopn:2 Failed to open file +DATA1/db/onlinelog/group_5.271.673269473

ORA-01031: insufficient privileges

Errors in file ORACLE_BASE/diag/rdbms/db/db1/trace/db1_arc0_2089.trc:

ORA-00313: open failed for members of log group 5 of thread 2

ORA-00312: online log 5 thread 2: '+DATA2/db/onlinelog/group_5.394.673269475'

ORA-17503: ksfdopn:2 Failed to open file +DATA2/db/onlinelog/group_5.394.673269475

ORA-01031: insufficient privileges

ORA-00312: online log 5 thread 2: '+DATA1/db/onlinelog/group_5.271.673269473'

ORA-17503: ksfdopn:2 Failed to open file +DATA1/db/onlinelog/group_5.271.673269473

ORA-01031: insufficient privileges

Unexpected communication failure with ASM instance:

 error 1031 (ORA-01031: insufficient privileges

)

Unexpected communication failure with ASM instance:

 error 1031 (ORA-01031: insufficient privileges

)

Errors in file ORACLE_BASE/diag/rdbms/db/db1/trace/db1_arc0_2089.trc:

ORA-00313: open failed for members of log group 6 of thread 2

ORA-00312: online log 6 thread 2: '+DATA2/db/onlinelog/group_6.396.673269493'

ORA-17503: ksfdopn:2 Failed to open file +DATA2/db/onlinelog/group_6.396.673269493

ORA-01031: insufficient privileges

ORA-00312: online log 6 thread 2: '+DATA1/db/onlinelog/group_6.272.673269491'

ORA-17503: ksfdopn:2 Failed to open file +DATA1/db/onlinelog/group_6.272.673269491

ORA-01031: insufficient privileges

Errors in file ORACLE_BASE/diag/rdbms/db/db1/trace/db1_arc0_2089.trc:

ORA-00313: open failed for members of log group 6 of thread 2

ORA-00312: online log 6 thread 2: '+DATA2/db/onlinelog/group_6.396.673269493'

ORA-17503: ksfdopn:2 Failed to open file +DATA2/db/onlinelog/group_6.396.673269493

ORA-01031: insufficient privileges

ORA-00312: online log 6 thread 2: '+DATA1/db/onlinelog/group_6.272.673269491'

ORA-17503: ksfdopn:2 Failed to open file +DATA1/db/onlinelog/group_6.272.673269491

ORA-01031: insufficient privileges

This problem, we should comment "SQLNET.AUTHENTICATION_SERVICES=(NTS)" on sqlnet.ora file, and then login by sysdba

 $ sqlplus / as sysdba

SQL> alter system archive log current;

System altered.

and check alert log.

kcrrdmx: Successful archiving of previously failed ORL

If this article can't help, maybe should check trace file as well.