There is a know issue with the same manifestation.

Posting a log file may give more details.

Hi,

I'm using WinSCP with /console /script to upload a file to a FTP server. It happened today that WinSCP tried to send the same file forever. The script I used was:

option echo off
open ftp://user-id:password@host
option confirm off
option batch abort
option transfer binary
put -nopermissions -preservetime "C:\path-to-file-to-upload.zip" "/backup/4/"
exit

Any idea what happened and how I can avoid this problem?

Regards,
Mark