Listener Not Starting: IBM/AIX RISC System/6000 Error: 1: Not owner TNS-12555, TNS-12560, TNS-00525

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Problem Description: lsnrctl start command failing with following error message

> lsnrctl start

LSNRCTL for IBM/AIX RISC System/6000: Version 11.2.0.3.0 - Production on 12-AUG-2014 17:15:10

Copyright (c) 1991, 2011, Oracle. All rights reserved.

Starting /oracle/DWR/112_64/bin/tnslsnr: please wait...

TNSLSNR for IBM/AIX RISC System/6000: Version 11.2.0.3.0 - Production
System parameter file is /oracle/DWR/112_64/network/admin/listener.ora
Log messages written to /oracle/DWR/saptrace/diag/tnslsnr/BWDB/listener/alert/log.xml
Error listening on: (ADDRESS=(PROTOCOL=IPC)(KEY=DWR.WORLD))
TNS-12555: TNS:permission denied
 TNS-12560: TNS:protocol adapter error
  TNS-00525: Insufficient privilege for operation
   IBM/AIX RISC System/6000 Error: 1: Not owner

Solution Description:

1.   Check these directories are present in the unix file system

/tmp/.oracle or /var/tmp/.oracle

2.   Rename or remove these above directories using root user.

3.   Start the listener using the oracle user.

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