TNS:12541 ERROR

TNS:12541 error: No Linstner



Solution:



1.Check the target Db's listener.ora , check for HOST and PORT ensure that both are correct.



2. Bounce the LNSRCTL (STOP and then start it)



3. Now ping the target database again.



EXAMPLE:

C:\orcl>tnsping earth

TNS Ping Utility for 32-bit Windows: Version 9.2.0.1.0 - Production on 26-FEB-2008 16:28:11
Copyright (c) 1997 Oracle Corporation. All rights reserved.

Used parameter files:C:\orcl\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the aliasAttempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.16.12.35)(PORT = 1522))) (CONNECT_DATA = (SID = EARTH) (SERVER = DEDICATED) (SERVICE_NAME = EARTH)))

TNS-12541: TNS:no listener

C:\myorcl>lsnrctl

LSNRCTL for 32-bit Windows: Version 9.2.0.1.0 - Production on 26-FEB-2008 16:24:19
Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.
Welcome to LSNRCTL, type "help" for information.


LSNRCTL> stop



Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))The command completed successfully



LSNRCTL> start



Starting tnslsnr: please wait...
TNSLSNR for 32-bit Windows: Version 9.2.0.1.0 - ProductionSystem parameter file is C:\myorcl\network\admin\listener.oraLog messages written to C:\myorcl\network\log\listener.logListening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.16.12.35)(PORT=1522)))
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))STATUS of the LISTENER

------------------------

Alias LISTENER

Version TNSLSNR for 32-bit Windows: Version 9.2.0.1.0 - ProductionStart Date 26-FEB-2008 16:24:33

Uptime 0 days 0 hr. 0 min. 2 sec

Trace Level off

Security OFF

SNMP OFF

Listener Parameter File C:\myorcl\network\admin\listener.oraListener

Log File C:\myorcl\network\log\listener.logListening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc))) (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.16.12.35)(PORT=1522)))Services Summary...Service "EARTH" has 1 instance(s). Instance "EARTH", status UNKNOWN, has 1 handler(s) for this service...Service "PLSExtProc" has 1 instance(s). Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

The command completed successfully



C:\orcl>tnsping earth

TNS Ping Utility for 32-bit Windows: Version 9.2.0.1.0 - Production on 26-FEB-2008 16:35:18
Copyright (c) 1997 Oracle Corporation. All rights reserved.

Used parameter files:C:\orcl\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the aliasAttempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.16.12.35)(PORT = 1522))) (CONNECT_DATA = (SID = EARTH) (SERVER = DEDICATED) (SERVICE_NAME = EARTH)))

OK (20 msec)