In this example, we will connect to the listener and check the value inbound_connect_timeout.

1. Check which user is used for the db then switch to it:

gzdbaix@root:/home/root # [color=blue]ps -ef | grep pmon[/color]
    root 17957102  9699736   0 13:02:57  pts/4  0:00 grep pmon
[color=green]oragzdb[/color] 41025558        1   0   Apr 13      -  0:37 ora_pmon_GZDB
lefp01simp01@root:/home/root # [color=blue]su - oragzdb[/color]

2. Verify on which listener you need to connect:

$ [color=blue]ps -ef | grep tns[/color]
oragzdb 24969260        1   0   Apr 13      -  1:13 /oracle/102_64/bin/tnslsnr [color=green]GZDB[/color] -inherit

3. Connect to the listener

$ [color=blue]lsnrctl[/color]

LSNRCTL for IBM/AIX RISC System/6000: Version 10.2.0.4.0 - Production on 16-APR-2013 13:03:23

Copyright (c) 1991, 2007, Oracle.  All rights reserved.

Welcome to LSNRCTL, type "help" for information.

LSNRCTL> [color=blue]set curr GZDB[/color]
Current Listener is GZDB

LSNRCTL> [color=blue]show inbound_connect_timeout[/color]
Connecting to (ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROCGZDB))
[color=green]GZDB parameter "inbound_connect_timeout" set to 60[/color]
The command completed successfully