Two of my Vigor routers have failed their latest PCI check.
They are showing a self signed certificate (which is expected as I don't have any certificates on them), on Port 52843
The PCI test is showing this as 'tcp over ssl'
I have run an online port checker myself and confirmed that port 52843 is open

I have been through the entire configuration of the Draytek multiple times, and I cannot find any reference to port 52843 and why it would be open for inbound traffic.
Any suggestions on how I trace / identify this issue (and resolve it!)

I don't really want to pay for a certificate on every router (we have a few) - or use the 'free' certificates (that only last a short period).
I looked in the firewall settings to see if I could close that port there, but the firewall rules all appear to be 'outbound'?

Any ideas or suggestions would be welcome!