I am trying to boot through PXE. DHCP and TFTP are raised and work, but in one moment when client requests iso from server I got this:udhcp: sending discover.....udhcp: no lease, failingcould not assign ip address from dhcpand connecting, written in every config file, through 10.0.0.1 cannot be established. I found in web some cases, similar to mine, but nothing has to do with PXE-boot. Where can I detect this error?   
cannot assign ip address from dhcp
ubuntu;pxe