TNS-12555 while installing Apps using rapidwiz

This problem popped up when I was installing Oracle EBS 11i on an linux server.

Error Msg:
LSNRCTL for Linux: Version 9.2.0.6.0 - Production on 06-OCT-2008 13:10:08

Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.

Starting /d01/oracle/proddb/9.2.0/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 9.2.0.6.0 - Production
System parameter file is /d01/oracle/proddb/9.2.0/network/admin/PROD_linuxerp/listener.ora
Log messages written to /d01/oracle/proddb/9.2.0/network/admin/prod.log
Error listening on: (ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROCPROD))
TNS-12555: TNS:permission denied
TNS-12560: TNS:protocol adapter error
TNS-00525: Insufficient privilege for operation
Linux Error: 1: Operation not permitted

Symptom:
While installing EBS using rapidwiz ora-12555 popped up at the end of 20% saying "failed to run external process".

Cause:
file permission under "/var/tmp/.oracle" is not proper.

Solution:
Metalink Note: 472386.1

Change file permission to oracle.dba under /var/tmp/.oracle and retry.