Locust, I tested your scenario and I was able to reproduce nearly identical results. I'm not entirely sure why this is occuring and why ICS is conflicting in this way with FlashFXP.
When ICS is disabled and I switch back to my normal network setup this behavior disapears.
(normal setup, PC1 -> Gigabit switch -> PC2)
My first thought was to use the "Bind sockets to IP" option via the site profile to determine if binding to the ICS NIC would solve the problem, but I didn't notice any difference. You may want to try this as you may get different results.
You might also try switching between PASV and PORT mode. I didn't notice any difference but you might.
At this time more testing is required to determine the exact cause of this problem.
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