Cannot access some HTTP:// sites from within a standard virtual machine on Orcon.

Orcon UFB under UFF (Hamilton)
Orcon "white" NF4V

Apart from a couple of port forwards (and therefore admin interface on LAN port 8080), left basically standard.

On a machine in the network.
Windows 10 pro virgin install.
Hyper-V
Single "external virtual switch", no vlan tagging.
Windows 2012 trial (from Microsoft's VHD)

- gets it's ip VIA DHCP from the NF4V (reserved by MAC address)
Regardless of browser, On the W2012 I can access only some internet HTTP:// websites.

eg:      Cannot access www.bing.com, but can access https://www.bing.com
    Can access http://www.google.com and https://www.google.com

The host machine can access any of these sites.


Tried:
I've turned off smartscreen, browser protection, etc.
opened, and even disabled the W2012 firewall.
Switched to VMWARE player.
Switched to a different host (A Win7 one).
Configured windows on the VM to use a proxy (and set up CCproxy on another host in the network).  This works, but does not solve my problem.
Set the VM to use the host's WIFI, and tethered to my mobile phone.  This worked too but does not solve my problem.
Messed with many settings on the NF4V, but set them back when nothing worked.
Called Orcon.  They said "Virtual networks / machines are not supported".