I'm actually using a very cool software called tftpd32 as DHCP server on my desktop computer, to assign IP address to my embedded board, when I am working out of the office. This software developed by Ph. Jounin (link) is a tftpd client/server, dhcp server and sntp server.
By default that new version enable an automatic ping request before assigning an IP address to make sure that IP is not currently used. The problem is when KITL starts VMINI interface, it asks by default for an IP address using a DHCP request again. As the board already ask for an IP address during the boot process of the bootloader, an IP address is already assign to the MAC address of the board. So TFTPD32 send a ping request to the board IP address with the board MAC address (see TCP/IP protocol specification).
As the network interface of the board is not completely initialized (remember KITL is currently in the initialization process), but receives a ping request and it locks the KITL VMINI initialization.
So to avoid that misunderstood between the device and TFTPD32 you have to disable that functionality.