NIC config in OL 7

Over the years I have created scores of VMs running Oracle Linux 5 and 6, running under Virtual Box.  I have just created my first OL 7 machine (again, under VBox) and am having difficulty with the networking.

My standard practice when I create a new Linux vm is to give it two NICs. The first configured NAT, with a DHCP address, and the second as HOSTONLY, with a fixed address. 

Ran the installation on the machine, configured the NIC and have this:

And the relevant config file:

The hostonly NIC is on enp0s8,  IP addres 192.168.56.24.  When I ping it from the host desktop, it just times out.  Of course I can't get a putty session to even attempt to connect.