Problems FTP'ing a save file from PC to AS/400

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I am trying to FTP a save file (WRKDBF) from my PC to my AS/400.

The PC is running XP Pro, if it matters, and the AS/400 is running V5R1M0, cum 
SF99510.

When I run the PUT statement to transfer the file, on the PC side it displays 
the message "150 Sending file to member WRKDBF in file WRKDBF in library XXXXX" 
for about a minute, then it bombs, with message "> Netout :Connection reset by 
peer", then "Connection closed by remote host"

What is wrong here?  Do I have a configuration problem that is causing it to 
time out?

Thanks in advance for your help/suggestions...

Steve Landess
Austin, Texas
(512) 423-0935