How to Resolve Oracle SQL Developer 'No Listener' Connection Error
How to Resolve Oracle SQL Developer 'No Listener' Connection Error
The "No Listener" error in Oracle SQL Developer indicates the application can't connect to the Oracle database listener. Resolve this by first verifying the listener is running on the database server using `lsnrctl status`. If not running, start it with `lsnrctl start`. Next, confirm the hostname and port in your SQL Developer connection settings match the listener configuration (listener.ora). Check firewall rules on both the client and server to ensure port 1521 (or the port your listener uses) is open for communication. Finally, examine the tnsnames.ora file (if applicable) for accuracy and ensure the SERVICE_NAME matches the database instance name. Restarting SQL Developer after these checks is often beneficial.
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