The default second HTTPS port — usually a management UI in a Java or container stack.
IANA registered 9443 to WSO2 as tungsten-https, and WSO2 products still serve their management console over it. The port became the generic "HTTPS on a non-privileged port" convention: Portainer publishes its UI on 9443, Tomcat and other Java servers commonly pair 9443 with 9080/8080, and a long list of network appliances use it for their web admin. Expect TLS and an administrative login page.
Expose with care
The transport is encrypted, but what sits behind it is usually a full administrative console — often with a default certificate and, on appliances, default credentials. Restrict it to a management network.
$ curl -skI --max-time 5 https://TARGET:9443/Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.