Hi,
I get the same problem.

• Get a DHCP address for loading EFI file
• Get a DHCP address for Ipxe
• Failing on the next step with the following error :
  udhcpc: sending discover 3x3 times
  Either DHCP failed or we were unable to access http://…

Spanning-tree doesn’t seem to be the problem as connect the server and the client on a clean switch with ports configured as “portfast”. But i may be wrong somewhere.
According to my tcpdump on the server, i never receive any dhcp request.
So maybe this “mini-os” doesn’t have drivers for my DELL 3310
I did try many “.efi” files, but none has worked. so maybe the .efi is not the problem.

Would you mind explaining to me which file Fog is trying to load at this point ?
So I could try to debug

Thanks