@JackWallington Please answer George’s questions first. As well let me add this one. Do you have a D-Link DGS-3620 switch between your HP desktop and the FOG server? If not you still might check to see if some kind of DOS attack prevention is enabled on a switch connecting those two - more information see here.

Can you run the troubleshooting script found here: https://forums.fogproject.org/topic/4581/let-s-make-scripts

And see if it points anything out?