DATE :-- 1st Sep 2014

               Error at time of listener startup Linux Error: 111: Connection refused

Error :-- 

LSNRCTL>reload

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.56.161)(PORT=1521)))

TNS-12541: TNS:no listener

 TNS-12560: TNS:protocol adapter error

  TNS-00511: No listener

   Linux Error: 111: Connection refused

Issue :--

Incorrect Entry in /etc/hosts files

The Entry in the /etc/hosts was

[oracle@PR11G ~]$ cat /etc/hosts

127.0.0.1 localhost.localdomain

192.168.56.161 PR11G.localdomain PR11G

Resolution :-- 

I edited the /etc/hosts and put localhost at the last of 127.0.0.1

The new entry

[oracle@PR11G ~]$ cat /etc/hosts

127.0.0.1 localhost.localdomain localhost

192.168.56.161 PR11G.localdomain PR11G

LSNRCTL> reload

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.56.161)(PORT=1521)))

The command completed successfully

LSNRCTL> LSNRCTL> status

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.56.161)(PORT=1521)))

STATUS of the LISTENER

------------------------

Alias                     LISTENER

Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production

Start Date                31-AUG-2014 22:49:24

Uptime                    0 days 0 hr. 1 min. 52 sec

Trace Level               off

Security                  ON: Local OS Authentication

SNMP                      OFF

Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora

Listener Log File         /u01/app/oracle/diag/tnslsnr/PR11G/listener/alert/log.xml

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.56.161)(PORT=1521)))

Services Summary...

Service "DBPR11G" has 1 instance(s).

  Instance "DBPR11G", status READY, has 1 handler(s) for this service...

Service "DBPR11GXDB" has 1 instance(s).

  Instance "DBPR11G", status READY, has 1 handler(s) for this service...

The command completed successfully

LSNRCTL> [oracle@PR11G admin]$