TNS-12508: TNS:listener could not resolve the COMMAND given

Getting below TNS error while changing the trace level for the listener

LSNRCTL> set trc_level user

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROCEBSSBX_SSL)))

TNS-12508: TNS:listener could not resolve the COMMAND given

Fix:

===

Turn off the ADMIN_RESTRICTIONS in listener.ora

cat listener.ora | grep -i restrictions

ADMIN_RESTRICTIONS_SHAIKDB =  ON

change it to:

ADMIN_RESTRICTIONS_SHAIKDB =  OFF

LSNRCTL> stop SHAIKDB

LSNRCTL> start SHAIKDB

or

[oracle@collabn1 ~]$ lsnrctl stop shaikdb

LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 14-OCT-2015 10:51:24

Copyright (c) 1991, 2009, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=collabn1.shaiksameer)(PORT=1522)))

The command completed successfully

[oracle@collabn1 ~]$ lsnrctl start shaikdb

Now try to reset the trace level:

=====================

LSNRCTL> set current_listener shaikdb

Current Listener is shaikdb

LSNRCTL> set trc_level off

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=collabn1.shaiksameer)(PORT=1522)))

shaikdb parameter "trc_level" set to off

The command completed successfully

LSNRCTL> save_config

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=collabn1.shaiksameer)(PORT=1522)))

Saved shaikdb configuration parameters.

Listener Parameter File   /u01/app/oracle/product/11.2.0.2/SHAIKPROD/network/admin/listener.ora

Old Parameter File   /u01/app/oracle/product/11.2.0.2/SHAIKPROD/network/admin/listener.bak

The command completed successfully