How do I fix TNS no listener error?

The Solution First, make sure that the listener is up and running. To do this, go to the Control Panel into Services under NT or listener control program (LSNRCTL). If the listener is up and running, the problem may lie with the listener not having been associated with the correct instance or protocol.

How do I fix ORA 12541 TNS no listener?

4 Answers

1. Step 1 – Edit listener. ora. This file is located in: Windows: %ORACLE_HOME%\network\admin\listener.
2. Step 2 – Restart Oracle services. Windows: WinKey + r services.msc. Linux (CentOs): sudo systemctl restart oracle-xe.

How do I enable TNS listener?

Do the following:

1. Log on to the host where the Oracle database resides.
2. Change to the following directory: Solaris: Oracle_HOME/bin. Windows: Oracle_HOME\bin.
3. To start the listener service, type the following command: Solaris: lsnrctl START. Windows: LSNRCTL.
4. Repeat step 3 to verify that the TNS listener is running.

How do I start the Oracle listener?

To start or stop the listener at the command line:

1. Open a command window.
2. Follow the steps listed in “Configuring the Operating System Environment Variables .”
3. Enter either of the following commands, depending on whether you want to start or stop the listener: lsnrctl start lsnrctl stop.

What is a TNS error?

In some Oracle database versions, this error may be called “ORA-12154: TNS:could not resolve service name.” The connect identifier is not able to resolve and may be caused by one or more of the following issues: Inability to connect to the repository due to unplanned server and network outages.

How do I resolve TNS 03505?

TNS-03505: Failed to resolve name tips

1. Verify that you have spelled the database name correctly, and that the database has an appropriate entry in the tnsnames.
2. Verify that there are not multiple tsnnames.
3. If connecting to a client machine, make sure there are no firewall issues blocking the connection.

How do I install TNS Listener service?

Configuring Access to Oracle JServer

1. Start Oracle Net Manager.
2. In the navigator pane, expand Local > Listeners.
3. Select a listener.
4. From the list in the right pane, select Listening Locations.
5. Click Add Address.
6. Select the TCP/IP or TCP/IP with SSL protocol from the Protocol list.

How do I restart my listener?

How do I start a database?

To start or shut down Oracle Database:

1. Go to your Oracle Database server.
2. Start SQL*Plus at the command prompt: C:\> sqlplus /NOLOG.
3. Connect to Oracle Database with username SYSDBA: SQL> CONNECT / AS SYSDBA.
4. To start a database, enter: SQL> STARTUP [PFILE=path\filename]
5. To stop a database, enter: SQL> SHUTDOWN [mode]

What is TNS entry in Oracle?

A TNS (Transparent Network Substrate) name is the name of the entry in tnsnames.ora file which is kept in $ORACLE_HOME/network/admin. This file contains the information which is used by the system to connect to oracle database.

What is the TNS name in Oracle?

TNSNAMES.ORA is a configuration file that the Oracle database uses. It allows users and applications to connect to Oracle databases by matching a connection name with all of the relevant details. It’s written using a specific syntax, which I’ll cover later in this article.

How to check if the Oracle listener is running?

Open a command window

What does Oracle error message ora-12154 mean?

ORA-12154 error is very common error related to ‘tnsnames.ora’ file.This error will come when oracle is unable to locate the service name specified in ODBC data source.ORA-12154 error will come at local service when application tries to connect with remote server.This error will come in following situations :