If this is still not solved, I would like to look into the php-fpm configuration and the log file related to php-fpm. From the apache side your initial post says session time has expired. I’m seeing a lot of multicast posts in the forum. There may be something else going on we don’t expect.

Thanks for responding so quickly, it was very helpful. The procedure was the one described in this post and this forum. Sorry for the Spanish, is it possible to change the title?

I did get uefi net booting with secure boot enabled working. I updated the tutorial here [ https://forums.fogproject.org/topic/11194/poc-using-fog-as-a-netboot-server/2 ] with the guidance.