The installation procedure for SSL certificates assumes that the appliance is listening on port 443.
If the appliance listens on port 8443, can the same certificate be used?
An uploaded SSL certificate does not apply to port 8443 access on the parconfig interface.
/parconfig maintains the default cert to ensure access to the appliance in case a corrupted cert was somehow uploaded and caused issues accessing the other interfaces.
The default certificate for /parconfig is by design and cannot be changed.