FTP Port problem

[slon]

I'm trying to connect to FTP server on port 22: ftp://xxx.xxx.xxx.xxx:22 on Win2000 SP6a
After connection established server asks me to enter ID and Password and after I entered it TC6.01 tries to execute "Get DIrectory" and gives me the following message:

530 Only client IP address allowed for PORT command

and pops up the window "PORT command Failed!"

As a result, I'm connected to the server, but see nothing, just a blank panel, and cannot do uploads or downloads

Does anybody know, what to do?

The log looks like this
---------
Connect to: (01/12/2004 12:16:10 PM)
hostname=xxx.xxx.xxx.xxx:22
username=
startdir=
220 Serv-U FTP Server v4.2 for WinSock ready...
USER xxxxxxxxx
331 User name okay, need password.
PASS ***********
230 User logged in, proceed.
SYST
215 UNIX Type: L8
FEAT
211-Extension supported
MDTM
MDTM YYYYMMDDHHMMSS[+-TZ] filename
SIZE
SITE PSWD;EXEC;SET;INDEX;ZONE;CHMOD;MSG
REST STREAM
XCRC filename;start;end
211 End
Connect ok!
PWD
257 "/f:/ftp" is current directory.
Get directory
TYPE A
200 Type set to A.
PORT 10,172,112,207,18,141
530 Only client IP address allowed for PORT command.
QUIT
221 Goodbye!

[sqa_wizard]

Sounds like a firewall which allows only a specific IP address to connect over port 22 ?