I did another test, I had already changed the switch port where my server is connected to 100Mbps and had left the port where my machine is in Auto [1000], every things perfect. When I changed the machine port to a fixed value of 100Mbps, the problem began to occur in the port that previously worked.
I’m not sure, but I think I’ve already tried to create an image on another machine model on a 100Mbps port and the problem did not occur. Is this a problem on HP’s PC, which only accepts network boot at 1000Mbps?