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

LSNRCTL> set  log_directory /u01/app/oracle/product/11.2.0.2/dbhome_2/network/admin/lsnrlog

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

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

the above issues happen while i’m trying to set log directory for listener. But It refused the comments, Why it’s refused the commands means I enabled the ADMIN_RESTRICTIONS parameter option in listener.ora file. So that reason, I cann’t set command used as administrator level, It restircted for executing the following set command options like SET TRC_FILE, SET TRC_DIRECTORY,SET TRC_LEVEL, SET LOG_DIRECTORY,SET LOG_STATUS,SET CURRENT_LISTENER,SET STARTUP_TIME.

When enabled, ADMIN_RESTRICTIONS instructs the Listener not to accept any administrative commands from lsnrctl. Instead, an administrator must log in to the Listener’s host OS and make configuration changes directly in listener.ora.

So In this case, We should  disable the  ADMIN_RESTRICTIONS_LISTENER = OFF and after reload the listener.

This parameter used for preventing from hackers who are trying to take the listener trace file through remote and It refused the set commands…

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TNS-01251: Cannot set trace/log directory under ADR

When you’re trying to set new listener log directory, you may face a same error below

LSNRCTL> set log_directory /u01/app/oracle/product/11.2.0.2/dbhome_2/network/admin/lsnr_log 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxxxx)(PORT=1521)))

TNS-01251: Cannot set trace/log directory under ADR

Solution :

If the parameter DIAG_ADR_ENABLED_listenername is set to ON in the listener.ora file, the trace and log file should be located under ADRBASE_listenername location. If ADR is enabled, all listener related trace file and log file stored in under ADR base location. If you don’t want to store there, you can disable ADR.

In listener.ora file

DIAG_ADR_ENABLED_LISTENER = OFF

reload the listener.

LSNRCTL> reload

LSNRCTL> set log_directory /u01/app/oracle/product/11.2.0.2/dbhome_2/network/admin/lsnr_log
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxxxx)(PORT=1521)))
LISTENER parameter "log_directory" set to /u01/app/oracle/product/11.2.0.2/dbhome_2/network/admin/lsnr_log The command completed successfully