Yeah my bet is because that server is SOOOO new that the FOS Engine kernel is miss identifying the network adapter and tries to patch it. Ideally it would be to get one of those nics to work but that may take some time for the linux developers (not FOG developers) to create the drivers. The quickest way to get this up and running is to install an older GbE nic in a riser slot. And then pxe boot off of that.
Do you have windows running already on one of these R430s? If so could you get the vendor ID and hardware ID of these nics? The FOG developers will need this information.
And lastly I have to be “that guy” FOG is intended to image workstations not servers. Moving into the server area opens up a new can of worms with raid controllers and crazy redundant hardware, all requiring specific linux hardware drivers. That’s not a space the developers are interested in, at this moment in time. Understand I’m not saying no, just meh.