FlashFXP Forums - Help with site to site transfers

I have been unable to get a successful file transfer. I am enthralled with FlashFXP and would like to register but I must be able to get server to server trnsfers to work to make it worthwhile. When I attempt a transfer, after a long period of time, an empty copy of the file sometimes, but not always, seems to get written to the receiving server. Then, as shown below, nothing, with an eventual timeout. I's really appreciate any help with this.

Connecting to My Plesk Server -> IP=216.69.171.205 PORT=21 (attempt # 1)
[R] Connected to My Plesk Server
[R] 220 ProFTPD 1.2.10 Server (ProFTPD) [216.69.171.205]
[R] USER uslp
[R] 331 Password required for uslp.
[R] PASS (hidden)
[R] 230 User uslp logged in.
[R] SYST
[R] 215 UNIX Type: L8
[R] FEAT
[R] 211-Features:
[R] MDTM
[R] REST STREAM
[R] SIZE
[R] 211 End
[R] PWD
[R] 257 "/" is current directory.
[R] CWD /httpdocs/
[R] 250 CWD command successful
[R] PWD
[R] 257 "/httpdocs" is current directory.
[R] TYPE A
[R] 200 Type set to A
[R] PASV
[R] 227 Entering Passive Mode (216,69,171,205,135,231).
[R] Opening data connection IP: 216.69.171.205 PORT: 34791
[R] LIST -al
[R] 150 Opening ASCII mode data connection for file list
[R] 226-Transfer complete.
[R] 226 Quotas off
[R] List Complete: 641 bytes in 0.61 seconds (1.0 KB/s)
[L] CWD /var/www/html/
[L] 250 CWD command successful
[L] PWD
[L] 257 "/var/www/html" is current directory.
[L] List (cached)
[L] List Complete: 1 KB in 0.14 seconds (8.6 KB/s)
[L] TYPE A
[L] 200 Type set to A
[L] PASV
[L] 227 Entering Passive Mode (64,139,171,51,151,31).
[R] PORT 64,139,171,51,151,31
[R] 200 PORT command successful
[R] STOR test.htm
[R] Connection lost: My Plesk Server
[R] Transfer Failed!