TNS-12541: TNS:no listener

TNS-12541: TNS:no listener

During tnsping, the following error is expected if the source listener is not running.

[oracle@xhydra dbs]$ tnsping db9zx

TNS Ping Utility for Linux: Version - Production on 17-JUN-2023 07:32:39

Copyright (c) 1997, 2019, Oracle.  All rights reserved.

Used parameter files:

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = <host>)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = db9zx)))
TNS-12541: TNS:no listener

Error utility says the following.

[oracle@xhydra dbs]$ oerr ora 12541
12541, 00000, "TNS:no listener"
// *Cause: The connection request could not be completed because the listener
// is not running.
// *Action: Ensure that the supplied destination address matches one of
// the addresses used by the listener - compare the TNSNAMES.ORA entry with
// the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to
// go by way of an Interchange). Start the listener on the remote machine.

Start the listener in source.

[oracle@xhydra ~]$ lsnrctl start

LSNRCTL for Linux: Version - Production on 17-JUN-2023 07:33:14

Copyright (c) 1991, 2019, Oracle.  All rights reserved.

Starting /u01/app/oracle/product/19.0.0/dbhome_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version - Production
System parameter file is /u01/app/oracle/product/19.0.0/dbhome_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/xhydra/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=xhydra)(PORT=1521)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xhydra)(PORT=1521)))
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version - Production
Start Date                17-JUN-2023 07:33:14
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/19.0.0/dbhome_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/xhydra/listener/alert/log.xml
Listening Endpoints Summary...
The listener supports no services
The command completed successfully

Tnsping works perfectly.

SERVICE_NAME = db9zx)))
OK (510 msec)

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