Turn off listener logging in oracle 12c release 2

I am trying to turn off listener logging in oracle 12c R2 (SAP on oracle), but I am getting a TNS-12508 error. I have verified that the listener.ora is owned by the oracle user and I am performing the task as same oracle user, but I am still getting an error. ### File Permissions -rw-r--r-- 1 oracle oinstall 1151 Oct 23 13:48 listener.ora ### Listener Error LSNRCTL> set current_listener LISTENER_AAA. Current Listener is LISTENER_AAA LSNRCTL> set LOG_STATUS OFF Connecting to (ADDRESS=(PROTOCOL=IPC)(KEY=AAA.WORLD)) TNS-12508: TNS:listener could not resolve the COMMAND given LSNRCTL> set log_status off Connecting to (ADDRESS=(PROTOCOL=IPC)(KEY=AAA.WORLD)) TNS-12508: TNS:listener could not resolve the COMMAND given Am I missing something here?