ORA-12541: TNS:no listener". (.Net SqlClient Data Provider)

[pdsQsql]

Hello,
I am having issue with connecting oracle from Sql Server using Linked Server.
I have installed Oracle client and Sql Server on both the same server.
I have tested TNSPING ORCL coming fine


C:\Windows\system32>TNSPING orcl

TNS Ping Utility for 64-bit Windows: Version 11.2.0.1.0 - Production on 02-OCT-2020 13:00:03
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\app\oracle_user\product\11.2.0\dbhome_1\NETWORK\ADMIN\sqlnet.ora

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME=orclXDB)))
OK (0 msec)


Checking Listener status for the service

C:\Windows\system32>lsnrctl status

LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 02-OCT-2020 13:00:24

Copyright (c) 1991, 2010, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER

Alias LISTENER
Version TNSLSNR for 64-bit Windows: Version 11.2.0.1.0 - Production
Start Date 01-OCT-2020 23:30:11
Uptime 0 days 13 hr. 30 min. 55 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File C:\app\oracle_user\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora
Listener Log File C:\app\oracle_user\tnslsnr\ORATEST\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.\pipe\EXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 3 handler(s) for this service...
Service "Oracle8" has 1 instance(s).
Instance "ORCL", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully



When I run sqlplus OraUser@ORCL, it's throwing an error:

ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

When I try to create the linked server and test it, getting following error:
ORA-12541: TNS:no listener". (.Net SqlClient Data Provider)

Please also see the following Sqlnet, tnsnames and listener.ora files

Sqlnet.Ora

SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

TNSNAMES.ORA

LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)

ORCL=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME=orclXDB)
)
)

LISTENER.ORA

LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)

ORCL=
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME=orclXDB)
)
)



My Linked Server script is:


USE master;

EXEC sys.sp_addlinkedserver @server = N'ORCL'
,@srvproduct = N'Oracle'
,@provider = N'OraOLEDB.Oracle'
,@datasrc = N'orcl';


-- Configure the server for remote procedure calls
EXEC dbo.sp_serveroption @server = N'ORCL' -- sysname
,@optname = 'rpc out' -- varchar(35)
,@optvalue = N'true' -- nvarchar(128)

EXEC sys.sp_addlinkedsrvlogin @rmtsrvname = N'ORCL'
,@useself = 'false'
,@locallogin = NULL
,@rmtuser = N'OraUser'
,@rmtpassword = N'**';




I have tried few things from the Google but didn't help, trying to follow the steps as other have provided.

Thanks for your help!

[skhanal]

Did you reboot SQL Server after you installed Oracle client and created linked server?. I have faced this many times and reboot fixes it "magically"

[Nancy96]

Hello,
ORA-12541 means the listener isn?t running or there?s a config issue.

Check the listener with lsnrctl status. If it?s not running, use lsnrctl start.
Verify tnsnames.ora matches the listener settings (hostname, port, service name).
If connecting remotely, make sure the port (default 1521) isn?t blocked by a firewall.
Look at sqlnet.ora for restrictive settings like SQLNET.ALLOWED_NODES.