FXP transfer not working.

Hi Everyone,
I was searching for an FTP application which could do server to server transfers, and on researching I did find some clients, including SMARTFTP.
When i establish the FXP session between the two servers and try to transfer a directory (with subdirectories) it fails. It creates the directory and then aborts the transfer. I tried to go in manually and transfer the two files in the example directory and it gives me the following error

500 Invalid PORT Command.
Entering PASV mode.....

FYI, I am running IIS FTP servers. Do i need to do any changes in the IIS configuration for it to allow server-2-server transfers?

Any help is highly appreciated.
Thanks
-sree

afaik IIS FTP doesnt allow FXP

darix