help on using fetch 3.03 for ftp

[congsuo@ifi.unizh.ch (Suo Cong)]

Hi all,

I have met a strange problem when I was using fetch3.03 to download
files from a Unix FTP server to my apple machine. The fetch program
will pop up a window to display such following message after some
files are transfered.

 ------------------------------------------------
  Server Response: Can't build data connection:
                   Address already in use 
 ------------------------------------------------

And then the ftp aborts. 

Anybody knows why and how to resolve it?

Thanks in advance.