Have you used the Samsung PRO Tool before? Can download other files from the shell?
You have given too little information about the problem.
Here are some possible reasons for this situation:
I´ll been traying from two different IP address:
IPv4 Address. . . . . . . . . . . : 192.168.100.9
IPv4 Address. . . . . . . . . . . : 10.142.24.99