@Tom-Elliott but I fond something here in the forum and I was wondering if this are the steps i should do to make it works:
Install of fog with the “-S” option to activate SSL
Copy of the certificate and the private key on the machine
Edit the Vhost file with the path of the private key and the certificate (with a restart of Apache2)
Modify the CA by default in the directories /etc/apache2/ssl/CA/ and /opt/fog/snapins/ssl/CA/ with our own CA
Execute the script buildipxe.sh from the directory /path/to/fogproject_git_repo/utils/FOGiPXE/
And finally, copy the new binaries from /path/to/fogproject_git_repo/packages/tftp to /tftpboot