ORA-21561: OID generation failed

[oracle@ora-golden2 admin]$ sqlplus 'sys/vihaan@stdy as sysdba'

SQL*Plus: Release 12.1.0.2.0 Production on Sun Oct 5 12:49:22 2014

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

ERROR:

ORA-21561: OID generation failed

I have no idea why I am getting above error ..

on Oracle linux 6.5 , work around is restart network services and try again 

as a root ......

[root@ora-golden2 ~]# service network restart

Shutting down interface eth0:  Device state: 3 (disconnected)

                                                           [  OK  ]

Shutting down loopback interface:                          [  OK  ]

Bringing up loopback interface:                            [  OK  ]

Bringing up interface eth0:  Active connection state: activating

Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/3

state: activated

Connection activated

                                                           [  OK  ]

[root@ora-golden2 ~]# su - oracle

[oracle@ora-golden2 ~]$ sqlplus 'sys/vihaan@stdy as sysdba'

SQL*Plus: Release 12.1.0.2.0 Production on Sun Oct 5 12:49:49 2014

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Connected to an idle instance.