Cry about...
Oracle Troubleshooting

ORA-12541: TNS: no listener


When trying to connect to Oracle the following error is generated:

ORA-12541: TNS: no listener

This error appears to be the same as the error ORA-12224. Although it may also indicate that the listener has not been started on the server.

These notes have been tested under Oracle 7.3.4 and Oracle 8.1.5 under Windows NT.

This page represents one page of many pages of notes I made whilst working with Oracle 7 through to 10i. I now no longer work with Oracle databases, but hope that these notes will continue to be of benefit to others.

About the author: is a dedicated software developer and webmaster. For his day job he develops websites and desktop applications as well as providing IT services. He moonlights as a technical author and consultant.