stm32f746 disco uImage port fail using TFTP

[Fish]

hi,

i'm trying to port uclinux into the 746 disco board for study

here is my settings

board ip 192.168.5.100

tftp server ip 192.168.5.120

i've used window tftp tool

but, it was failed to port uImage into the board using TFTP

i attached image that i 'm stuck in step

i don't know why this happend

does anyone know what is problem?

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i can't belive this...

i accidently saw youtube on the tftp and firewall settings

it was because of firewall..

ha........ well... now i have loaded uImage

bye..