Yes, all ports are opened, because when I try simulate boot from PXE with tftpd32.exe (set dhcp server, set boot file, set tftp folder and disable BMR MTFTP & BMR PXE services), client booting from PXE perfectly. I in lockup. Probably, it is necessary to refuse from BMR in favour of WDS or another product. There is an idea that PXE the server does not give the list of files - any parser does not work...