This specific Firefox error typically means the browser expected a secure encrypted response but received plain text (HTTP) instead.
- Common Causes: Trying to access a site via
https://on a server or port (usually 443) that is not properly configured for SSL . - Troubleshooting: Ensure that your SSL certificate is correctly installed and bound to the correct IP address in your hosting dashboard. If you are using a proxy or CDN (like Cloudflare), ensure the SSL settings are synchronized between the proxy and your Hostaday server .