I have the same issues...
iVentoy 1.0.20 running on Ubuntu Server. External DHCP OK, redirecting to PXE, but, receive same response above.
[EDIT]
My uefi file is another: iventoy_loader_16000_uefi
NBP filename is iventoy_loader_16000_uefi
NBP filesize is 0 Bytes
PXE-E99: Unexpected network error.
Waiting for someone...
iVentoy 1.0.20 running on Ubuntu Server. External DHCP OK, redirecting to PXE, but, receive same response above.
[EDIT]
My uefi file is another: iventoy_loader_16000_uefi
NBP filename is iventoy_loader_16000_uefi
NBP filesize is 0 Bytes
PXE-E99: Unexpected network error.
Waiting for someone...