ORA-12541: TNS:no listener

OK, Almost every body who have worked in Oracle would have seen this error message. This is one of most frustrating and most common error

What does "ORA-12541: TNS:no listener"  mean ?

This means, TNS Listener server is down on the target database server. Check if the listener is up and running.




If your database is running on a windows box, go to services on the database server and check the service is running.