oracle 11.2.0.4 is not connecting to sql prompt. -- ORA-27271: szingroup: group lookup failure
I am working on oracle 10g to 11.2.0.4 upgrade activity, Installation is successful. But it is not working properly. We have installed oracle software on some other env and upgraded successfully.
sqlplus "/as sysdba"
SQL*Plus: Release 11.2.0.4.0 Production on Sat Jan 11 23:15:34 2014
Copyright (c) 1982, 2013, Oracle. All rights reserved.
ERROR:
ORA-27271: szingroup: group lookup failure
IBM AIX RISC System/6000 Error: 3: No such process
Additional information: 869
Enter user-name:
Thanks,
Kiran