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Hello Vincentbri,
Hope it is not too late and this can help others, what you are describing is an expected behavior for security in SDA networks. starting 17.4+ version there was and enhancement in the security described in the "CSCvu28035 ENH - LIS...
Sorry, I know maybe it is too late, but you need to modify the block-side in the tftp in order to sent the files faster. In this wait, the same file that spends 5 minutes with the blocksize 512, it is going to be transfer in 10 seconds.
Switch(conf...
