Oracle Listener / database error

Question

When I try to connect to the database (10g) I get:
Oracle Connection Error received : Unable to make conection, ORA-12514: TNS:listerner does not currently know of service requested in connect descriptor.
I used it before and it was working fine, I tried to fix it by using the TNSPING orcl command, but no luck, so how can I fix this?
Thanks in advance!

Answer 1

You can try to fix the error following Oracle Error Desciption,
First to make sure your database is up and running.
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Cause: The listener received a request to establish a connection to a database or other service. The connect descriptor received by the listener specified a service name for a service (usually a database service) that either has not yet dynamically registered with the listener or has not been statically configured for the listener. This may be a temporary condition such as after the listener has started, but before the database instance has registered with the listener.
Action: - Wait a moment and try to connect a second time.
- Check which services are currently known by the listener by executing: lsnrctl services <listener name>
- Check that the SERVICE_NAME parameter in the connect descriptor of the net service name used specifies a service known by the listener.
- If an easy connect naming connect identifier was used, check that the service name specified is a service known by the listener.
- Check for an event in the listener.log file.