@george1421 Hello George,
First of all thank you for your answer!
I just checked and this option is indeed disabled…

Good morning all,
I leave it to you because after hours of research on the internet I find similar concerns but no solution!
I have a virtualized fog server on a Hyper-V infrastructure + a virtualized windows DHCP server too.
I try to boot in pxe from another virtual machine but here is what I get:

Start PXE over IPv4
Station IP address is 192.168.71.3

  Server IP address is 192.168.70.9
  NBP filename is undionly.kpxe
 Downloading NBP file ...

 NBP thread download successfully

And after the machine goes to the next boot option…
I thank the people who can help me
Thank you and good evening to all