winscp does not reconnect when working in ftp server

When working with the below script which should uload ota-mrvl.zip (200M) to ftp server (windows server 2003 + filezilla ftp server)
In case there is a timeout error in the middle of upload the winscp will try to reconnect and resume the copy.
Finally I get permission denied (see attached file).
< 2014-08-08 00:20:01.853 550 Permission denied --------------------> Here reconnect
two items checked as well:
1. in case server is linux the winscp work fine
2. Filezilla client works fine

Thankks,
Moshe


See below cmd file
option confirm off
open ftp://XXX:yyy@210.13.22.11 -rawsettings FtpProxyLogonType=1 ProxyHost=10.38.118.11 ProxyPort=2121 ProxyUsername=ddd ProxyPassword=dd
cd Firmware
option transfer binary
put ota-mrvl.zip ota-mrvl.zip
close
exit

Server side in the timeout set to 120sec caused to lock the file before timeout.

Issue close

No idea how filezilla client overcome this problem
Moshe