TNS no listener error when internet is enabled

Hi
When my internet connection is enabled and if i try to connect to the database, I get the No listener error.
Although I'm able to connect to database when there is no internet I find it hard to run my forms 9i as they run on Internet Explorer and only when there is internet connection.
Please help me in this regard.
Thanks in advance
rishank

I think, that your listener listen to only one address.
Try to edit tnsnames.ora to replace you hostname with local network address.

Similar Messages

ORA-12541: TNS:no listener Error When connected to net....

I am using internet via mobile on my pc. Whenever I am connected to the net I can't run the following code from Visual studio.
It shows the following error:
OleDbException was unhandled
ORA-12541: TNS:no listener
I have no idea about it.please help!!
***************************Code Section*****************
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
using Oracle.DataAccess.Client;
namespace gridques
public partial class Form1 : Form
OleDbConnection newConnection;
public Form1()
InitializeComponent();
private void Form1_Load(object sender, EventArgs e)
newConnection = new OleDbConnection("Provider=MSDAORA.1;Data Source=orcl;User ID=project;Password=project");
newConnection.Open();//////********IT SHOWS THE ERROR HERE*************
private void show_Click(object sender, EventArgs e)
OleDbCommand resultsCommand = null;
OleDbDataAdapter resultsAdapter = new OleDbDataAdapter();
DataTable resultsTable = new DataTable();
try
// establish command object and data adapter
resultsCommand = new OleDbCommand("select * from stock order by serialNo", newConnection);
resultsAdapter.SelectCommand = resultsCommand;
resultsAdapter.Fill(resultsTable);
dataGridView1.DataSource = resultsTable;
catch (Exception ex)
MessageBox.Show(ex.Message, "Error in Processing SQL", MessageBoxButtons.OK, MessageBoxIcon.Error);
resultsCommand.Dispose();
resultsAdapter.Dispose();
resultsTable.Dispose();
}

Hi,
ORA-12541: TNS:no listener
Many reason but first thing need to check is "Is your listener is up and running on the server"
lsnrctl statusregards,
Taj

Connect to Oracle through ODBC - TNS: No Listener Error

Hi All,
I've been trying to chase this problem down for over a month now and I have had no luck. When I try to connect to an Oracle server through MS Access I get the TNS: No Listener error. The kicker is when I go to the odbc data source administrator in windows I am able to connect to the oracle server. My computer is windows 2007 and I have Oracle 11.2 installed. Could anyone assist?
When I type lsnrctl start in the command prompt it says it has been already started.
Here is my tnsnames.ora:
ORMANRPT.WORLD=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP)
(HOST=bspz1565.bhdc.att.com)
(PORT=1521)
(CONNECT_DATA=
(SID=ORMANRPT)
Here is my sqlnet.ora:
AUTOMATIC_IPC = OFF
TRACE_LEVEL_CLIENT = OFF
names.directory_path = (TNSNAMES)
names.default_domain = world
name.default_zone = world
names.default_domain=world
here is my listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\cb260e\product\11.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\cb260e\product\11.2.0\dbhome_1\bin\oraclr11.dll")
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
ADR_BASE_LISTENER = C:\app\cb260e

1009773 wrote:
I used this computers IP and name. Is this what my listener should look like?
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\cb260e\product\11.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\cb260e\product\11.2.0\dbhome_1\bin\oraclr11.dll")
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = 144.158.355.240)(HOST = ilcdf44v.itservices.ms.com)(PORT = 1521))Line above is WRONG!
I suggest you move, remove, rename, delete or otherwise move the listener.ora file out of the way.
listener.ora is NOT required to start or utilize the listener
open Command Window after doing as directed above then issue the OS commands below
lsnrctl stop
lsnrctl start
lsnrctl status
# now wait 60+ seconds before issuing the next command below
lsnrctl service
COPY the results from all above, then PASTE all results back here.

TNS:No listener error: Please help me

Hi all,
I have installed Oracle 10g in my laptop.few weeks back i was able to work on that. But today when i tried to connect to my database(im using Toad) i am getting TNS:No Listener error.
I checked in Listener.ORA file also. All seems to be fine.
What could be the probelm?? Can anyone pls help me in this regard?
Thanks in advance.
Raghu

Hi,
check whether listener is Up and running or not.
Use lsnrctl and check for status
Thanks
Pavan Kumar N

Gives ORA-12560: TNS: protocol adapter error when installing oracle 10g

I tried to install oracle 10g r2 in server 2008. but it gives ORA-12560: TNS: protocol adapter error when installing. how I can fix this issue??? please help me ASAP. because its urgent.
thanks in advance.
chamara

Welcome to the forums !
Pl indicate which version of 10g you are installing and on which version of Win 2008. Neither 10gR1 nor 10gR2 are certified to be installed on Win 2008 R1, AFAIK.
For 10gR2, only 10.2.0.5 is certified for Win 2008 R2 - see MOS Doc 1173433.1 (How to Install Oracle 10.2.0.5 on MS Windows 7 / Windows 2008R2)
Also see MOS Doc 740926.1 (Where can I find the Database / Client software to download for Microsoft Vista, or Windows 2008R1?).
Both 10gR1 and 10gR2 are now in extended support - is there a reason you are not using 11gR2 ?
HTH
Srini

ORA-12541: TNS:no listener, (error, in oracle 11g for window 7, 64 bit)

ORA-12541: TNS:no listener, error, in oracle 11g for window 7, 64 bit
While connecting as localhost is pretty well.
but command: sqlplus username@'192.168.52.178:1521/orcl' on the same machine is producing above mentioned error on oracle 11g for window 7, 64 bit.

user11225434 wrote:
Thax sir for your kind concern of my problem. Answers of your quaries regarding my question as follows
lsnrctl status
LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 05-AUG-2013 09:37
:21
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 - Produ
ction
Start Date                05-AUG-2013 09:31:09
Uptime                    0 days 0 hr. 6 min. 22 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   C:\app\eee\product\11.2.0\dbhome_5\network\admin\liste
ner.ora
Listener Log File         c:\app\eee\diag\tnslsnr\eee-THINK\listener\alert\log.x
ml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.52.170)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "orclxe" has 1 instance(s).
Instance "orclxe", status READY, has 1 handler(s) for this service...
Service "orclxeXDB" has 1 instance(s).
Instance "orclxe", status READY, has 1 handler(s) for this service...
The command completed successfully
# listener.ora Network Configuration File: C:\app\eee\product\11.2.0\dbhome_5\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = C:\app\eee\product\11.2.0\dbhome_5)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:C:\app\eee\product\11.2.0\dbhome_5\bin\oraclr11.dll")
LISTENER =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.52.170)(PORT = 1521))
ADR_BASE_LISTENER = C:\app\eee
3. My ip is static 192.168.52.170 and window 7 prof. is there.
4. Sir i have tested the remote connection with firewall configuration is off.
Hopefully this info is useful.
but command: sqlplus username@'192.168.52.178:1521/orcl'
NOTE the difference in IP#s above; 192.168.52.170 vs. 192.168.52.178

ORA-12560: TNS:protocol adapter error when trying to connect

hopefully somebody can help me out... the problem i'm having is connecting to the scott/tiger database. i keep getting :
"ORA-12560: TNS:protocol adapter error" when trying to connect to it. it worked previously, but i unistalled oracle 8i personal and reinstalled it. now it doesn't let me connect. what's going on?
thanx,
uriah

You can run the net8 assistant to set up your tnsnames.ora file.
start/programs/oracle/network administration/net8 assistant
When you are done it should look something like this:
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS =
     (PROTOCOL = TCP)
     (Host = )
     (Port = 1521)
(CONNECT_DATA = (SID = ORCL))
Bev

TNS-12560: TNS:protocol adapter error (when starting database)

Hi.. everyone.
I am testing oracle9i and oracle10g on the same machine, windows xp pro.
When I was trying to start oracle10g using command line mode,
I got the error, TNS-12560: TNS:protocol adapter error.
I entered these command.
set oracle_home=10g_homexxxx
set oracle_sid=xxdb
sqlplus /nolog
conn sys/xxx as sysdba
I got the error, TNS-12560: TNS:protocol adapter error.
The install of two different versions of oracle , oracle9i and oracle10g,
on the same machine(windows xp pro) could cause this problem?
Is it safe to install two different versions of oracle on the same window machine?
Is there any confliction in environment variables?
I think there is no problem on the linux, unix system.
I stoped the listener of oracle9i and tried again. But I failed.
I am looking forwared to hearing your experience and advice.
Thanks in advance. Have a good day.
Ho.

Dear Werner.
Thanks for your reply.
I shutdown oracle9i and 10g, using "services.msc" utility from windows.
Therefore, "OracleService<xxdd>" is not running.
What I want to do is to startup 10g database using "cmd",command line mode.
In addition, I would like to know why I could not start 10g database, using "cmd"
on windows xp pro.
I installed 9i first and installed 10g. I think there are a kind of environment variable
conflictions.
I am wondering how I can fix them, and whether or not they are curable.
Thanks for your reply. Have a good day.
Regards.
Ho.

TNS Ora-12532 error When connecting with Db11 running in the VM

I created a virtual machine from the PVM Entrerprise Linux 5 64 bits and db11g.
Inside the virtual Machine the sqlplus system/manager1@VDB11 is working well.
The tnsping 172.20.0.33 is working well too.
But from the other external machine using oracle 11g client these command are not working: Tns Ora-12532 error.
What to do?
Thanks

my virtual machine: vm1 have an static ip address 172.20.0.33
the oracle listener is was configured with the same ip
in the virtual machine : vm1 the /etc/hosts file content is:
127.0.0.1 localhost.localdomain
172.20.0.33 virtualdb11
in the tnsnames.ora file in the virtual machine i have a service:
VDB11 ...( host=172.20.0.33) (port=1521)
under console connection with my virtual machine vm1 the command : sqlplus system/manager1@VDB11 is working well
but when i working in an other external machine , where the tnsnames.ora have an entry:
VDB11 ...(host=172.20.0.33)......
the ping command : ping 172.20.0.33 is working well
but sqlplus system/manager1@VDB11 is not work and return the error:
ora-12532 tns

Getting ORA-12560: TNS:protocol adapter error when starting Oracle8i SVRMGR

Hi everyone,
I'm new to the forums, and I guess you could say "somewhat new" to the Oracle DB. I've played around with it casually in the past, but never got real serious with it :)
Anyhow, I wanted to see if someone could help with this. I found an old thread on a similar issue, but nothing seemed to help at all towards resolution, so I thought I would start a new thread, and maybe get some fresh ideas.
The issue is, I start SVRMGR on Oracle8i, and get the ORA-1260: TNS:protocol adapter error.
Here is my setup:
OS: Win2k Advanced Server
CPU: 2 - 930MHz Intel Xeon's
RAM: 1GB DIMM
DB Version: Oracle8i
No firewalls or any other TCP interference. Ok, so now that's out the way :), here is the issue:
When I start the SVRMGR, I get that error immediately. I have checked my tnsnames.ora file, and found some discrepancies, and have corrected them (at least to my knowledge), restarted all the Windows services running the various databases, and closed/re-opened the SVRMGR, and still get the same thing.
For reference, here is a copy of the tnsnames.ora file:
# TNSNAMES.ORA Network Configuration File: C:\oracle\ora81\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
INST1_HTTP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP) (HOST = 207.225.221.92) (PORT = 1521) )
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = class.oracle)
(PRESENTATION = http://admin)
#CLASS =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = class.oracle)
#LOGEDNET =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = LOGEDNET.oracle)
BFLEDNET =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = BFLEDNET.oracle)
#CSPEDNET =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = CSPEDNET.oracle)
#FLGEDNET =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = FLGEDNET.oracle)
#FINEDNET =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = FINEDNET.oracle)
CCHSRES =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = CCHSRES)
#CCHS =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = CCHS)
CHYEDNET =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = CHYEDNET)
#AUREDNET =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = AUREDNET)
#TUSEDNET =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = TUSEDNET)
## DBs on ORACLESHC - 207.225.221.80
DENEDNET =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.80)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = DENEDNET)
DFEDNET =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.80)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = DFEDNET)
FTCEDNET =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.80)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = FTCEDNET)
OGDEDNET =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.80)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = OGDEDNET)
PROEDNET =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.80)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = PROEDNET)
SILVER7 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.80)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = SILVER7)
# CCHS_PROD =
# (DESCRIPTION =
# (ADDRESS_LIST =
# (ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.87)(PORT = 1521))
# (CONNECT_DATA =
# (SERVICE_NAME = CCHS)
ONLINEDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = ONLINEDB)
GLOBALDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 207.225.221.92)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = GLOBALDB)
The ones I commented out were either non-existant databases, or the databases were shutdown, because they are not presently being used.
If someone could help with this, it would be greatly appreciated. :)

HI,
1). Can you connect normally from SQL Plus?
-----------------------Here is entry in your Tnsnames.ora file.------------------------------
#You must check that your Dbase Listener is Listening request on port 1521.
ORCL9i =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Local-Server)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl9i)
2). For pinging a service.
If you've Microsoft Windows.
If your database service name is orcl9i
Run->Cmd
Tnsping orcl9i
--It will give you as following information either "OK" or Fail.
----------------------------------Output after running Tnsping--------------------------------------------
TNS Ping Utility for 32-bit Windows: Version 9.2.0.1.0 - Production on 26-JUL-20
07 13:30:16
Copyright (c) 1997 Oracle Corporation. All rights reserved.
Used parameter files:
E:\oracle\ora92\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
(HOST = Local-Server)(PORT = 1521))) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = Orcl9i)))
OK (20 msec)
I would like to mention that Svrmgr30 was in Oracle 8. And Oracle 8i uses Svrmgrl.
--Below is Oracle9i syntax you may use it on svrmgrl.
SQL> connect
Enter user-name: Scott/Tiger@orcl9i
SQL> connected:
SQL>

TNS-12560: TNS:protocol adapter error when starting listner

Hi,
I am having this error when trying to start my oracle database listener.
I can connect to database normally with SqlPlus
Microsoft Loopback Adapter is installed and config with a fixed IP address. The IP add with computer name and domain is specified in the hosts file.
I didn't modify anything to the default listener.ora file.
Any suggestion. Thank you very much.
Best regards
K.

Now I am able to start my listener after I turn off my firewall and restart my computer. The port might be blocked previously ?
However, now I can't connect to the database even in Sql plus. When connect using user name and password, I have the same error: TNS-12560: TNS:protocol adapter error.
Testing my connection in Net CA, it said: "TNS:listener does not currently know of service requested in connect descriptor".
In tnsnames.ora, I have SERVICE_NAME= orcl.
Result of tnsping orcl is "..OK<100msec>"
But result of lsnrctl services is: "The listnener supports no services"
I can't find any clue?
P/S: I am using Oracle database 11g EE Release 11.1.0.7.0 on Window platform.
Edited by: user12635456 on 13-Jun-2010 20:42

TNS:no listener error with dblink

I am able to connect to oracle database 10g machine from other machine with oracle 8i then I have create dblink in 8i machine but when I am accessing 10G database it is giving me error
for example select count(*) from t_cons@orcl
ORA-12541: TNS:no listener
is it a version issue or something else?

Thanks Dushyant.
following is the result of query
SQL> select value from v$parameter where name='global_names';
VALUE
TRUE
SQL> select global_name from global_name;
GLOBAL_NAME
JBPONM.US.ORACLE.COM
one thing I have noticed that when I am connecting to database server with same
hostname & dbname then there is no problem but when hostname & dbname is
different then it is not connecting through dblink.
I have gone through oracle doc but no where it is mentioned that both should be same.

ORA-12541: TNS:no listener error from client mechine

We have oracle 11g server from onsite and I am trying to connect from offshore client.But I am getting error
From SQL plus i am getting the error,
ORA-12541: TNS:no listener
and from SQL Developer I am getting the error,
IO Error:The network adapter could not establish the connection
I am able to Telnet the host with proper port.Onsite peoples able to connect the database from any client using the same TNS names configration I am using.
What are the possibilities to get this errors ?
Please guide me on this.

sadasivam wrote:
Hi
Thanks for reply.I checked with onsite DBA for listener and it is up.If you have an on-site DBA why aren't you working with him to solve the problem?
Since you assert that other client machines are able to connect to the database, the issue must be with your own setup. I strongly suspect your tnsnames has a bad entry. Please compare it to the same file from a working client. Also, show us the contents of your tnsnames.ora file.
>
I dont have access of disable the firewall in my clent mechine.I will get it done by network team and post you the status.

"TNS:no listener" error

Hi,
I have got Oracle 9iR2 on Redhat 8 I have installed Oracle 9i client software on Windows 2000.
Using the Oracle Net Configuration Assistant I am trying to set up my connection to my Linux server. When I com to test the connection I get
CONNECTING ORA-12541: TNS:no listener
The listner is started on the linux box so I am a bit stuck at the moment
I would be very greatful if someone who has set up a linux server/windows client before could let me know what they did or if anyone knows of any documentation that would be a good starting point
many thanks
James Norton

Check the SID you configured in the client with <oracle_home>\network\admin\tnsnames.ora.
Venkat.

TNS-12541 TNS: No Listener error HELP!!!

Hello,
We have installed Oracle 8.0.5 on Windows 2000.
Oracle was well installed (no errors) but sometimes we can connect to the database (via SQL+ or by a tnsping on the client), sometimes we cannot and it shows above message (TNS-12541 TNS: No Listener). That is very strange: the listener do really exist and is running. (Service is started). I tried to stop and start manually the listener (tnslnr80) but the 'start' failed (it was too long so I killed the command).
Can someone help us to solve this or to understand what happens?
Thx a lot
Nivotiana

Mohammed ... wrote:
Thanks all your help and support..
I reconfigured the instant client following below link :
[http://www.dbatoolz.com/t/installing-oracle-instantclient-basic-and-instantclient-sqlplus-on-win32.html]
and followed your advises as well and i can now connect to database though any user
But unfortunately, i cannot connect as sys user, it gave me below error :
C:\Users\mohammed>sqlplus sys as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Tue May 7 17:29:56 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-12560: TNS:protocol adapter error
C:\Users\mohammed>
Could you please advise..
Regards,
MohammedIf the client is on the same machine as the database, then you don't have ORACLE_SID set.
More likely the database is on a different server, you have to specify 'sqlplus sys/pswd@dbname'.
And your db will need to be configured to allow remote sysdba authorization, which is not a good idea from a security perspective.

TNS no listener error when internet is enabled

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