port blocking?

Hi. I'm experiencing a strange problem. I'm trying to transfer information
from a Windows 2003 server to an FTP account on a Windows XP computer.
However, for some reason it won't transfer. The FTP on the XP machine is
fine, and happily accepts files from another other computers, and the
Windows 2003 server is fine connecting to other FTP accounts. Any idea
whether Windows 2003 could be blocking this connection for some reason?

Connecting to ***.***.**.***, Port 21 (#1)
Connected. Waiting for response.
220-Microsoft FTP Service
220 Hello!
USER Tom
331 Password required for Tom.
PASS xxxxxx
230 User Tom logged in.
SYST
215 Windows_NT
REST 100
350 Restarting at 100.
REST 0
350 Restarting at 0.
PWD
257 "/" is current directory.
TYPE A
200 Type set to A.
PORT ***.***.**.***,10,44
200 PORT command successful.
LIST
150 Opening ASCII mode data connection for /bin/ls.
425 Can't open data connection.
PASV
227 Entering Passive Mode (***.***.**.***,9,193).
ERROR: [Data]: No route to host