When i try to log on to Oracle it gives an error TNS:no listener, WHY?

Question

hi guys,
WHen i try to log on to the Oracle 8i server using the user: SYSTEM and password: manager, it gives an error
ERROR:
ORA-12541: TNS: no listener
why this occurs and how do i fix the problem? please give me step by step instructions TY :)
Message was edited by:
user502781

Answer 1

ORA-12541 ...
- The client is requesting connection to a service.
- The service is derived from the alias used in the connection. For example, @orcl ... orcl = alias.
- The alias is used to look up the host, listener port and service in the tnsnames.ora
The listener is on the same machine as the database. The listener must be up and listening on the port the client want to use.
If the listener is not up, there wil be an "ORA-12541: TNS: no listener" error;
If the listener is listening on the wrong port, there wil be an "ORA-12541: TNS: no listener" error;
If the client is asking for the wrong port, there wil be an "ORA-12541: TNS: no listener" error.
To start the listener in Windows, go to the Control Panel > Administration Tools > Services and ensure the Ora?????Listener is started.
To verify the listener is up, open a command box, and type 'lsnrctl status'
To see what the client is expecting, on the client machine open a command box, and type 'tnsping {alias}' where you replace {alias} with the alias to be used in the connection.