[SIZE=4][B]Problem Solved[/B][/SIZE]
[B]PXE - E53 boot file not received[/B]
While uploading the image from a system to Fog server my network switch is turned of by accident. Then restarting all the services I received “[B]PXE - E53 boot file not received” [/B]error from all the clients.
I reinstalled the the Fog setup ( sudo ./installfog.sh ), then all is going fine.[B][/B]