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There can be various reasons for this issue. Some possibilities are:

1. Incorrect connection URL: The connection URL used to connect to MongoDB may be incorrect, which can cause the connection to fail.

2. Firewall or network issues: The firewall or network settings may be blocking the connection between Node.js and MongoDB.

3. Incorrect authentication credentials: If authentication is required to connect to MongoDB, the credentials provided may be incorrect, causing the connection to fail.

4. MongoDB server issues: The MongoDB server may be experiencing issues or may not be running, which can cause the connection to fail.

To troubleshoot this issue, it is recommended to start with checking the connection URL, firewall or network settings, and authentication credentials. If these are all correct, then checking the MongoDB server logs may provide more information about the issue.