FileZilla is open source.  If you want, you can modify it to give you 
what you want.
http://filezilla.sourceforge.net/

Tomas Larsson wrote:

>I am looking for a freware FTP-client that I can use to debug an embedded
>FTP-Server.
>
>I find ftp-clients such as WS_DTP and the command-line client in XP not
>useful.
>What I need is a tool tha shows me all comm between the client and the
>server including low-level comm.
>
>Sofar they just throw an "unknown error", and I cant find out why.
>
>When I am looking on a the packet received from the server, it looks ok, but
>there is no response from the client, after the first server ACK.
>
>Anyone that has any ideas.
>
>With best regards
>
>Tomas Larsson
>Sweden
>http://www.naks.mine.nu for downloads etc.
>ftp://ktl.mine.nu for uploads. Or use the free www.yousendit.com service.
>
>Verus Amicus Est Tamquam Alter Idem
>
>
>
>  
>

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