How to troubleshoot when the Oracle listener fails to start.

6 months ago

2 minutes

When the Oracle listener does not respond when starting, it may be due to various reasons. Here are some possible solutions:

Check the listener configuration file: Make sure that the configuration in the listener file (listener.ora) is correct. You can use the lsnrctl status command to check the status of the listener and see if there are any error messages.
Check if the listener service is running: Manually start the listener service using the “lsnrctl start” command, and then try connecting to the database again.
Check if the port is in use: Ensure that the port being used by the listener is not being used by another process. You can use the netstat command to check the port usage.
Check the firewall settings: If using firewall software, make sure the listener’s port is allowed through the firewall.
Check the network connection: ensure that the network connection is working properly, you can try pinging the database server to confirm that the network is clear.
Check the environment variables to make sure that ORACLE_HOME and ORACLE_SID are correctly configured.

If none of the above methods work, it is advisable to consult the official Oracle documentation or seek help from Oracle’s official technical support.