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TNS-12541 TNS-12560 TNS-00511 Linux Error: 111

[oracle@localhost ~]$ lsnrctl

LSNRCTL for Linux: Version 10.2.0.1.0 – Production on 18-JAN-2012 22:45:15

Copyright (c) 1991, 2005, Oracle. All rights reserved.

Welcome to LSNRCTL, type “help” for information.

LSNRCTL> reload
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost.localdomain)(PORT=1521)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused
LSNRCTL> service
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost.localdomain)(PORT=1521)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused

This problem is related with IP address. To solve, just follow the following simple steps:-

[oracle@localhost ~]$ su – root
Password:
[root@localhost ~]# vi /etc/hosts (copy & paste the below line)

127.0.0.1 localhost.localdomain localhost

[root@localhost ~]# su – oracle
[oracle@localhost ~]$ lsnrctl start

LSNRCTL for Linux: Version 10.2.0.1.0 – Production on 18-JAN-2012 22:51:23

Copyright (c) 1991, 2005, Oracle. All rights reserved.

Starting /u01/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait…

TNSLSNR for Linux: Version 10.2.0.1.0 – Production
System parameter file is /u01/oracle/product/10.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/oracle/product/10.2.0/db_1/network/log/listener.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1521)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost.localdomain)(PORT=1521)))
STATUS of the LISTENER
————————
Alias LISTENER
Version TNSLSNR for Linux: Version 10.2.0.1.0 – Production
Start Date 18-JAN-2012 22:51:24
Uptime 0 days 0 hr. 0 min. 0 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/oracle/product/10.2.0/db_1/network/log/listener.log
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1521)))
Services Summary…
Service “PLSExtProc” has 1 instance(s).
Instance “PLSExtProc”, status UNKNOWN, has 1 handler(s) for this service…
Service “orcl” has 1 instance(s).
Instance “orcl”, status UNKNOWN, has 1 handler(s) for this service…
The command completed successfully

[oracle@localhost ~]$

HOW TO UNISTALL ORACLE COMPLETELY FROM LINUX REDHAT OR CENTOS.
Simply run the following commands:

[root@localhost ~]# rm -f /etc/oraInst.loc

[root@localhost ~]# rm -f /etc/oratab

[root@localhost ~]# rm -R -f /etc/oracle

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