Sure,
FOG: Running Version 1.4.4 SVN Revision: 6077
Kernal: 4.11.6
DHCP 067 Bootfile Name: ipxe.efi

Yes, secure boot is off in the BIOS on the tablet.

Its the Lonovo USB to Ethernet adaptor I’ve used it on multiple Lenovo X1 Laptops, Lenovo p51s and, Lenovo Miix 510 Tablet without issues. And even on this X1 Tablet I can boot into the fog Menu fine its just after it loads the init.xz that it hangs.

Im trying to image Lenovo X1 Tablet over PXE, I can boot into the fog menu but after I choose something it starts the loading process and gets to init.xz… OK then hangs on a black screen.

The UEFI is off on the X1 and im using the ipxe.efi Bootfile. I can image other systems fine. Any help would be greatly appreciated.

There are 2 Windows DHCP Servers but they are working in high availability so all settings are the same. option 66 is pointed at the fog server and 67 is undionly.kpxe

They are on different subnets, are there instructions for the wire-shark capture?

Updated working fog server to Running Version 1.3.4 now evry PXE boot Im asked for the tftp server address. The PXE boot settings on the dhcp server are correct it does PXE boot to the fog preboot but then Im prompted with “Please enter tftp server:”