Why Is My Node.js App Getting an ECONNREFUSED Error When Connecting to MySQL?

Unable to Connect to MySQL Server with Error: ECONNREFUSED

This error, commonly encountered in Node.js when trying to establish a connection to a MySQL server, usually indicates an issue with the connection establishment process.

Causes of the Error

• Incorrectly configured connection parameters, such as host, port, user, password, or database name.
• Firewall restrictions blocking communication between the client and server.
• Network or connectivity issues preventing proper connection establishment.
• Server not running or listening on the expected socket or TCP port.

Troubleshooting Steps

1. Verify Connection Parameters:

Ensure that the connection parameters specified in the code match the corresponding MySQL server configuration. This includes checking the database name, user credentials, and host information.

2. Check Firewall Settings:

Check your local firewall settings and the server's firewall configuration to ensure that communication is allowed between the client and the MySQL server. Open up port 3306 or the configured port for TCP/IP communication if necessary.

3. Ensure Server is Running:

Verify that the MySQL server is running on the expected host and port using commands such as netstat or ps. Ensure that the server is accepting connections on the correct socket or port.

4. Determine Socket Configuration:

If the MySQL server is listening on a Unix socket instead of a TCP port, modify the connection options to use the socket path, as demonstrated in the solution provided.

5. Resolve Network Issues:

Check for any network issues that may be affecting communication between the client and server, such as DNS resolution or routing problems. Use network diagnostic tools to identify any potential bottlenecks.

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