@tvigneau I suppose you have Windows installed on that machine you see rEFInd - Initializing... after the PXE menu, right?
If there is no task scheduled for a host the FOG iPXE menu will try to chainload the operating system from the local disk for you. Some hardware works just find while others just don’t play nicely at all. There are a few things you can try:
Edit this host’s settings in the web UI and try all the different settings for Host EFI Exit Type like SANBOOT, GRUB, EXIT… (obviously REFIND_EFI is what you see right now, being the default on UEFI systems) Some people tried to get their machines to chainload by playing with the options in /var/www/html/fog/service/ipxe/refind.conf - find hints on what to look at in the forums: 1, 2 If that doesn’t help either you can try using a different version of rEFInd. We still have 0.11.4 in use but here you find newer (and older version): https://sourceforge.net/projects/refind/files/ - You want to download refind-bin-0.x.y.zip, extract that and copy the file refind/refind_x64.efi from the archive to your FOG server and drop in /var/www/html/fog/service/ipxe/ (rename the original file before).