TNS-12542: TNS:address already in use

Trying to create a dedicated Listener for building active standby database without touching current listeners in a critical production environment. Then got those errors:

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 11-OCT-2016 14:24:31

Copyright (c) 1991, 2013, Oracle. All rights reserved.

Starting /u01/app/oracle/product/11.2.0/dbhome_2/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 11.2.0.4.0 - Production
System parameter file is /u01/app/oracle/product/11.2.0/dbhome_2/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/racnode1/listener_standby/alert/log.xml
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=racnode1)(PORT=8888)))
TNS-12542: TNS:address already in use
 TNS-12560: TNS:protocol adapter error
 TNS-00512: Address already in use
 Linux Error: 98: Address already in use

Listener failed to start. See the error message(s) above...

Checked port 8888 has been used :

$ netstat -na|grep -i 8888
tcp 0 0 127.0.0.1:34244 127.0.0.1:8888 TIME_WAIT
tcp 0 0 127.0.0.1:34245 127.0.0.1:8888 TIME_WAIT
tcp 0 0 ::ffff:127.0.0.1:8888 :::* LISTEN

SOLUTION

It is resolved by using a free port 9999.

$lsnrctl start LISTENER_STANDBY

$lsnrctl status LISTENER_STANDBY

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 11-OCT-2016 15:09:53

Copyright (c) 1991, 2013, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=racnode1)(PORT=9999)))
STATUS of the LISTENER
------------------------
Alias LISTENER_STANDBY
Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date 11-OCT-2016 15:07:36
Uptime 0 days 0 hr. 2 min. 17 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/dbhome_2/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/racnode1/listener_standby/alert/log.xml
Listening Endpoints Summary...
 (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=racnode1)(PORT=9999)))
Services Summary...
Service "TSTSTBY1" has 1 instance(s).
 Instance "TSTSTBY1", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully