By now, your droplet is already fortified — you’ve: Created a non-root user Secured SSH access Enabled a firewall The next essential step is to encrypt all traffic with HTTPS. Without HTTPS, sensitive data (like login credentials) is vulnerable ...

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CDN Edge Ops
On a single droplet I terminate TLS at nginx and leave the app on localhost only. After Certbot writes the cert paths, nginx -t then reload; if renew fails, check that /.well-known/acme-challenge is not proxied to the app.