Can log in, but not see files

[GoogleCodeExporter]

What steps will reproduce the problem? Please include as much detail as
possible.
1. Was able to log in
2. Username and password accepted
3. ls command doesn't work, I don't see any files like I would expect

230 Access granted
ftp> ls
200 PORT OK
421 Unable to accept data connection.  Service unavailable.
ftp> ls
150 Opening ASCII mode data connection for file list
ftp> ls
226 Data transmission OK
200 PORT OK
200 PORT OK
ftp> ls
421 Unable to accept data connection.  Service unavailable.
150 Opening ASCII mode data connection for file list
ftp> ls
226 Data transmission OK
200 PORT OK
200 PORT OK
ftp> ls
421 Unable to accept data connection.  Service unavailable.
ftp> ls
150 Opening ASCII mode data connection for file list
ftp>

What version of SwiFTP are you using?
1.24

What operating system are you using?
windows xp

Which FTP client are you using?
from the dos prompt

Which Android device and version do you have (Nexus, Droid, Hero, G1,
etc.)?
droid

May we contact you by email to ask questions? If so, what is your email
address?
Sure, it's paul.milne@gmail.com

Please provide any additional information below. The more details, the
better.

Original issue reported on code.google.com by paul.mi...@gmail.com on 30 Jun 2010 at 5:56

[GoogleCodeExporter]

I forgot to mention I was using the proxy server from the net, I did not 
attempt to use wifi.

Original comment by paul.mi...@gmail.com on 30 Jun 2010 at 5:59

[GoogleCodeExporter]

Try PASV mode, there may be a NAT box or firewall between you and the proxy. 
When you use regular (not PASV) mode, then there is a TCP connection that is 
made from the proxy to your system which could be blocked for security reasons.

If you're thinking that FTP couldn't possibly be that silly of a protocol, I 
assure you it's really true.

Original comment by Dave.Revell@gmail.com on 30 Jun 2010 at 9:47