Hello,
Tried this but when I try to install my first machine, vmlinuz and initrd still sized 0 and 
[root boot]# tail -f /var/log/foreman-proxy/proxy.log
2021-03-05T10:55:56 6fcadf91 [I] [2272] Started task ["/usr/bin/wget", “–connect-timeout=10”, “–dns-timeout=10”, “–read-timeout=60”, “–tries=3”, “–no-check-certificate”, “-nv”, “-c”, “http://mirror.centos.org/centos/8/BaseOS/x86_64/kickstart/images/pxeboot/initrd.img”, “-O”, “/var/lib/tftpboot/boot/centos-8-mirror-ejPIbtG4jFDG-initrd.img”]
Also set HTTP(S) proxy http://myProxy:3128 in the GUI
Machine was also rebooted.
but NOTHING.
Please where to check further ?
Regards