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What should I do if my Node.js application is throwing 'ECONNREFUSED' errors?

The 'ECONNREFUSED' error usually indicates that the target server is not reachable. Check if the server is running, and ensure that the hostname and port in your connection string are correct.

Encountering 'ECONNREFUSED' errors in a Node.js application typically indicates that the application is unable to connect to the specified server, often due to the server being down or misconfigured. The first step in troubleshooting this error is to verify that the target server is indeed running. If you’re attempting to connect to a local database or API, ensure that the service is active and listening on the expected port. Use tools like telnet or curl to test the connection manually; for instance, telnet localhost 3000 will help you determine if a server is responding on port 3000. Next, review your connection string for any typos or incorrect values, ensuring that the hostname, port, and other parameters are specified correctly. If the application is running in a containerized environment or using a cloud service, check the network settings and firewall rules to ensure that connections are allowed. If you are using Docker, ensure that the network mode is set correctly to enable communication between containers. By systematically checking these aspects, you can identify the cause of 'ECONNREFUSED' errors and implement the necessary fixes.

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