I took a second look at your logs and I noticed something that seems inconsistent.
Code:
[12:30:00] Transfer Timed Out
[12:30:05] [R] ABOR
[12:30:05] [R] Transfer Failed!
[12:30:05] [R] SIZE IESP-BAK_10.r02
[12:30:05] [R] 226 Transfer complete.
[12:30:05] [R] PWD
[12:30:07] [R] 500 Unknown command.
[12:30:07] [R] 213 166566543
[12:30:07] [R] 257 "/"
It looks like the input or output buffer isn't completely cleared after the transfer abort, I suspect that this might be part of the problem, so let me see about getting this resolved and we can go from there.
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