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listener is up but "lsnrctl status" says it is down

in Database Utilities (MOSC) 6 commentsAnswered

When I issue the command lsnrctl status on my Linux server. It indicates that listener is down. However the listener is up and client connection is working.

$ ps -fu oracle |grep tns

oracle   4509   1 0 Apr21 ?    00:00:39 /oracle/app/oracle/product/19.0.0/dbhome_1/bin/tnslsnr LISTENER -inherit

$ lsnrctl status

LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 23-APR-2021 11:33:28

Copyright (c) 1991, 2020, Oracle. All rights reserved.

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

TNS-12541: TNS:no listener

 TNS-12560: TNS:protocol adapter error

 TNS-00511: No listener

  Linux Error: 2: No such file or directory

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))

TNS-12541: TNS:no listener

 TNS-12560: TNS:protocol adapter error

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