A common problem with transfers from behind a router is misconfigured settings.
Make sure the port range configured in flashfxp is the SAME as the port range configured in your router, and that the port range is large enough (too small also causes problems).
Then make sure that flashfxp is sending the correct IP and PORT numbers in the PORT command.
From looking at your log, all i can think of is either the PORT command is sending the wrong ip (internal ip) or its telling the remote server to use a port that is not configured to be allowed through your router. Both of which cause this problem with the data connection. Simply put flashfxp is either listening on a port that is not being forwarded therefor the signal from the remote server never gets to your client, or its issuing the wrong ip in the PORT command which leads the remote server to send the info/data to the wrong ip altogether.
If this does not work, please provide more information: such as full logs for both clients, router configuration, and the client configuration.
Also you mention issues only with larger files, this also leads to thoughts about your router dropping or timing out the ftp session connection. If so, try turning on noops during transfer.
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