you sure that it was on?
[L] 421 Timeout (no new data for 1800 seconds)
1800 seconds is 30 minutes.
during login it says
[L] 220 You will be disconnected after 30 minutes of inactivity.
so it doesn't look like it was turned on.
(how huge was that jpeg file if you were transfering it for over 30minutes?
)