TNS-12541 :TNS :no listener

Question

I am newbie in oracle dba so need help that could meet my mind. I have installed my oracle 11gr2 database on virtual machine with OS OEL 5.7 and want to connect my this remote database with toad32bit. So i do follow some useful links and downloaded and installed win32_11gR2_client on OS windows 7 64bit . Besides try my best to follow the instructions my client is not able to connect with my remote oracle database.On client side working with cmd for tnsping sidname always get no tns listener with error as i mentioned above

brief descriptions LINUX MACHINE:

listener.ora

LISTENER =
  (DESCRIPTION_LIST =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
  (ADDRESS = (PROTOCOL = TCP)(HOST = testhost.testdomain.com)(PORT = 1521))
)
)
ADR_BASE_LISTENER = /u01/app/oracle

tnsnames.ora

ORCL =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = TCP)(HOST = testhost.testdomain.com)(PORT = 1521))
  (CONNECT_DATA =
  (SERVER = DEDICATED)
  (SERVICE_NAME = orcl.testdomain.com)
  )
 )

sqlnet.ora

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
ADR_BASE = /u01/app/oracle

lsnrctl status listener

Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                03-FEB-2014 15:08:43
Uptime                    0 days 1 hr. 32 min. 59 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/testhost/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=testhost.testdomain.com)(PORT=1521)))
Services Summary...
Service "orcl.testdomain.com" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB.testdomain.com" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

lsnrctl service listener

 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
 Services Summary...
 Service "orcl.testdomain.com" has 1 instance(s).
 Instance "orcl", status READY, has 1 handler(s) for this service...
 Handler(s):
 "DEDICATED" established:0 refused:0 state:ready
 LOCAL SERVER
 Service "orclXDB.testdomain.com" has 1 instance(s).
 Instance "orcl", status READY, has 1 handler(s) for this service...
 Handler(s):
 "D000" established:0 refused:0 current:0 max:1022 state:ready
 DISPATCHER <machine: testhost.testdomain.com, pid: 5349>
 (ADDRESS=(PROTOCOL=tcp)(HOST=testhost.testdomain.com)(PORT=13094))
 The command completed successfully

WINDOWS 7 CLIENT DESCRIPTION C:\\oracle\\product\\11.2.0\\client_1\\network\\admin ENV TNS_ADMIN=C:\\oracle\\product\\11.2.0\\client_1\\network\\admin

NOTE: THERE IS NO ANY ORACLE RELATED SERVICES PRESENT ( MEANS NOT PRESENT ) ON WINDOWS SERVICES

my client tnsnames.ora

ORCL =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = TCP)(HOST = testhost.testdomain.com)(PORT = 1521))
  (CONNECT_DATA =
  (SERVER = DEDICATED)
  (SERVICE_NAME = orcl.testdomain.com)
   )
  )

C:\\Users\\farhan>tnsping orcl (and the result is)

Used parameter files:
C:\oracle\product\11.2.0\client_1\network\admin\sqlnet.ora

Used TNSNAMES adapter to resolve the alias 
Attempting to contact (DESCRIPTION = (ADDTESS_LIST = (ADDRESS - (PROTOCOL = TCP (HOST = 
testhost.testdomain.com)(PORT = 1521))) (CONNECT_DATA= (SERVER = DEDICATIED) (SERVICE_NAME
= orcl) (INSCTANCE_NAME = orcl) (GLOBAL_NAME = orcl.testdomain.com)(RDB_DATABSE =   orcl)) (TYPE_OF_SERVICE = dedicaated))
TNS-12541 : TNS:no listener

cat /etc/hosts (the result is)

      # Do not remove the following line, or various programs
      # that require network functionality will fail.
      #127.0.0.1              testhost.testdomain.com testhost localhost.localdomain localhost
      127.0.0.1               localhost.localdomain localhost
      #10.10.1.114             testhost.testdomain.com testhost
      192.168.0.103   testhost.testdomain.com testhost
      ::1             localhost6.localdomain6 localhost6

for further insturctions that i have asked to post

# netstat -an | grep 1521 | grep tcp | grep LISTEN
tcp        0      0 0.0.0.0:1521                0.0.0.0:*                   LISTEN      
[root@testhost ~]# grep testhost /etc/hosts
#127.0.0.1              testhost.testdomain.com testhost localhost.localdomain localhost
#10.10.1.114             testhost.testdomain.com testhost
192.168.0.103   testhost.testdomain.com testhost
[root@testhost ~]# dig +short testhost.testdomain.com
174.137.125.92

Answer 1

After searching alot got a simple way to solve it. Just follow the steps:-

1. Check status of your listener

2. open command prompt and type lsnrctl status

3. You will get no listener.

4. So, now open listener.ora file which is present in following directory C:\\oraclexe\\app\\oracle\\product\\11.2.0\\server\\network\\ADMIN

5. Open that file and change the host parameter with you computer name ii} You can get computer name by right click on My Computer and check you computer name, and replace host parameter with your computer name as follows.

LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) (ADDRESS = (PROTOCOL = TCP)(HOST = Electron-PC)(PORT = 1521)) ) )

So here you can observe HOST = Electron-P , which is my computer name

6. Save the listener.ora file and again return to cammand propt
7. Type following in command prompt lsnrctl start

This will start the OracleTNSListner you can check it in the service by opening services tab of taskmanager. if not started automatically u can start it.

Just this much and you are ready to work again on oracle. Best of Luck.

Answer 2

I had the same problem once. I was able to connect after adding my computer name to: /etc/hosts "ip_address computer_name" .

hi all

i have also same problem, can any body suggest me the "computer_name" should my windows computer name where client install or remote server name where database install.

Answer 3

I had the same problem. The following worked for me.

• Uninstall all the oracle files from your computer if you had previously installed it. Stop all its services by going to services.msc in cmd.

  2. List item
  3. Restart your computer.

  4. Install oracle if you have not already.

  5. Then go to cmd

  6. Type services.msc in cmd 6.Select any service and type 'O'. This will get to you all the services starting with O. 7.Select OracleJobScheduerXE from the list. Right click go to properties.
  7. In general tab go to Startup type. Slect automatic from it.
  8. Click apply then click start and then OK. 10.Also Enable OracleXeClrAgent and start your service.So totally 4 services would be working out of 5 except OracleMTSRecoveryService.
  9. Now go to cmd type lsnrctl->enter-> type status u should be able tosee your instance.

Tell me if it helps.