Why the warning appears

QuantumTouch serves its management UI on port 8443 over HTTPS. The certificate
is either self-signed or signed by the controller's own local CA — a private
certificate authority that was created at install time and exists only on this
box. Because your browser has never seen that CA before, it cannot verify the
certificate chain, so it shows an "untrusted" or "potential security risk"
warning.

The connection is still encrypted. The warning means the browser cannot confirm
who issued the certificate, not that the traffic is unprotected.