Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 









Oracle Listener Error Message

Oracle Database Tips by Donald Burleson

Note:  Starting in 11gR2, the listener log is not activated by default.  You have to turn on listener logging:   logging_listener_name=on


I initially installed Oracle 8i on my PC.  Recently I installed Oracle forms 6i; since that day I have not been able to connect to my database.  I receive an ora-12203 error message because listener is not started.  I tried to start the listener service by going to Control Panel, Administrative Tools, and Services.  I still receive the same error message.

This question posed on 09 November 2005


Well, I can't solve your problem but I can direct you where to begin looking.  First, look for the listener log in $ORACLE_HOME/network/log. This may tell you why the listener will not start.  Also, check the database alert log to insure that the database is starting.  Sometimes the service will tell you it started when in fact it never gets to the point of being open. 

Try to manually start the listener.  Open a command prompt.  Set the oracle home and then start the listener, as shown below: 

C:> set ORACLE_HOME=C:\oracle\ora8i  (whatever yours is)

C:> lsnrctl start

If this fails you will have the errors that caused it to fail.  You can use the listener control utility to start, stop or check the status of the listener.

C:> lsnrctl status

I hope that will at least get you to the point of not getting the listener error message or to help you find out why the message is occurring.



Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.