I have the same problem! Yesterday everything worked fine with flashFXP, didn't do any changes, except for switching the switches for bank1/2, protect etc.
This is what I see:
WinSock 2.0
Connecting to 192.168.2.102
Connected to 192.168.2.102 -> IP=192.168.2.102 PORT=21
220-
220----------------------------------------------------------------------------
220-XBFileZilla version 1.4, (based on FileZilla Server 0.8.

220-
220-http://sourceforge.net/projects/xbfilezilla/
220----------------------------------------------------------------------------
220
421 Login time exceeded. Closing control connection.
Connection failed
Delaying for 120 seconds before reconnect attempt #1
Cant rememeber I saw the text about XBFileZilla before........
But I go search some more through the forums, maybe I find something........