Upload via proxy make problems

Hello,

we're using sfftplib.dll in version 1.5.7.0. On one of our costumers the transfer doesn't work.
They use squid as proxy on port 3128 and have user authentifaction. The logfile have no
error but on the ftp-server is only a file with 0 byte?! So we don't know what we have to do ...

Here are the logfile ...

[20060831 12:57:38] SmartFTP FTP Library v1.5.7.0

[20060831 12:57:38] Resolving host name "##########"

[20060831 12:57:38] Proxy: Resolving host name proxy

[20060831 12:57:38] Connecting to 213.69.202.131 Port: 21

[20060831 12:57:38] Proxy: Connecting to HTTP proxy server proxy Port: 3128

[20060831 12:57:38] Proxy: Connected to proxy server. Sending connection request.

[20060831 12:57:39] Connected to ##########.

[20060831 12:57:39] 220 ns1 Microsoft FTP Service (Version 5.0).

[20060831 12:57:39] USER ##########

[20060831 12:57:39] 331 Password required for ##########

[20060831 12:57:39] PASS (hidden)

[20060831 12:57:39] 230-loopline interactive media

[20060831 12:57:39] 230 User ########## logged in.

[20060831 12:57:39] SYST

[20060831 12:57:40] 215 Windows_NT version 5.0

[20060831 12:57:40] FEAT

[20060831 12:57:40] 500 'FEAT': command not understood

[20060831 12:57:40] TYPE I

[20060831 12:57:40] 200 Type set to I.

[20060831 12:57:40] REST 0

[20060831 12:57:40] 350 Restarting at 0.

[20060831 12:57:40] PWD

[20060831 12:57:40] 257 "/##########" is current directory.

[20060831 12:57:40] PASV

[20060831 12:57:40] 227 Entering Passive Mode (213,69,202,131,214,218).

[20060831 12:57:40] Proxy: Resolving host name proxy

[20060831 12:57:40] Opening data connection to 213.69.202.131 Port: 55002

[20060831 12:57:40] Proxy: Connecting to HTTP proxy server proxy Port: 3128

[20060831 12:57:40] STOR upload/3108061457.dfu

[20060831 12:57:40] Proxy: Connected to proxy server. Sending connection request.

[20060831 12:57:41] 125 Data connection already open; Transfer starting.

[20060831 12:57:41] 833 bytes transferred. (13,1 KB/s) (62 ms)

[20060831 12:57:41] 226 Transfer complete.

[20060831 12:57:41] QUIT

[20060831 12:57:41] 221 Goodbye!

[20060831 12:57:41] Client closed the connection.

Thanks 4 Help Ulf