connection was aborted by the software in your host machine

I've never had an issue connecting to our server before.

[09:41:56] SmartFTP v4.0.1144.0
[09:41:58] Resolving host name "www.ch-iv.com"
[09:41:58] Connecting to 72.32.92.50 Port: 21
[09:41:59] Connected to www.ch-iv.com.
[09:41:59] 220 ProFTPD 1.3.2e Server (ProFTPD) [72.32.92.50]
[09:41:59] USER ch-iv
[09:41:59] 331 Password required for ch-iv
[09:41:59] PASS (hidden)
[09:42:02] 230 User ch-iv logged in
[09:42:02] SYST
[09:42:02] 215 UNIX Type: L8
[09:42:02] Detected Server Type: UNIX
[09:42:02] RTT: 290.548 ms
[09:42:02] FEAT
[09:42:02] 211-Features:
[09:42:02] MDTM
[09:42:02] MFMT
[09:42:02] MFF modify;UNIX.group;UNIX.mode;
[09:42:02] MLST modify*;perm*;size*;type*;unique*;UNIX.group*;UNIX.mode*;UNIX.owner*;
[09:42:02] REST STREAM
[09:42:02] SIZE
[09:42:02] 211 End
[09:42:02] Detected Server Software: ProFTPD
[09:42:02] PWD
[09:42:03] 257 "/" is the current directory
[09:42:03] TYPE A
[09:42:03] 200 Type set to A
[09:42:03] PASV
[09:42:03] 227 Entering Passive Mode (72,32,92,50,160,167).
[09:42:03] Opening data connection to 72.32.92.50 Port: 41127
[09:42:03] MLSD
[09:42:03] Server closed connection
[09:42:03] An established connection was aborted by the software in your host machine.


I have turned off my firewall and added smartftp to my firewall exception list.

any help would really be appreciated

Please post your system information from the menu: Help->About "System Information" dialog.