If I'm using HTTPS, could SSL/TLS configuration be causing the ECONNRESET?

Yes, SSL/TLS configuration issues can lead to ECONNRESET errors. Ensure the server's SSL certificate is valid and trusted by your client. Mismatched TLS versions or cipher suites can also cause connection problems. Try disabling SSL verification in Postman (temporarily for testing only) to see if that's the issue, but remember to re-enable it for security.