Unable to retrieve directory listing

Same problem happening with 4.3.8 and 5.0.7
Connecing in passive mode, FTP port 21, Windows 2008 RC2 server

If I use the Win7 FTP client, I AM able to issue a 'dir' command after connecting and logging on

If I try either version of WinSCP, I get logged in but it always times-out in the message box that appears during connection, instead of retrieving the directory listing. I use the Commander GUI interface.

Once in a great while, I did get the directory listing to appear, but as soon as I would try to switch to another directory, WinSCP goes into 'application not responding' mode.

I was suspect of the windows FTP server, so I installed the Filezilla FTP server. I get the same behavior as above.

Log is attached below:

. 2012-07-16 20:46:46.482 --------------------------------------------------------------------------
. 2012-07-16 20:46:46.482 WinSCP Version 5.0.7 (Build 2268) (OS 6.1.7601 Service Pack 1)
. 2012-07-16 20:46:46.482 Configuration: HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\
. 2012-07-16 20:46:46.482 Local account: hugo\<username>
. 2012-07-16 20:46:46.482 Login time: Monday, July 16, 2012 8:46:46 PM
. 2012-07-16 20:46:46.482 --------------------------------------------------------------------------
. 2012-07-16 20:46:46.482 Session name: <username>@example.com (Stored session)
. 2012-07-16 20:46:46.482 Host name: example.com (Port: 21)
. 2012-07-16 20:46:46.482 User name: <username> (Password: Yes, Key file: No)
. 2012-07-16 20:46:46.482 Tunnel: No
. 2012-07-16 20:46:46.482 Transfer Protocol: FTP
. 2012-07-16 20:46:46.482 Ping type: C, Ping interval: 30 sec; Timeout: 15 sec
. 2012-07-16 20:46:46.482 Proxy: none
. 2012-07-16 20:46:46.482 FTP: FTPS: None; Passive: Yes [Force IP: No]
. 2012-07-16 20:46:46.482 Local directory: C:\Users\<username>\Documents, Remote directory: home, Update: No, Cache: Yes
. 2012-07-16 20:46:46.482 Cache directory changes: Yes, Permanent: No
. 2012-07-16 20:46:46.482 DST mode: 1
. 2012-07-16 20:46:46.482 --------------------------------------------------------------------------
. 2012-07-16 20:46:46.482 Session upkeep
. 2012-07-16 20:46:46.572 Connecting to example.com ...
. 2012-07-16 20:46:46.622 Connected with example.com. Waiting for welcome message...
< 2012-07-16 20:46:46.632 220 Microsoft FTP Service
> 2012-07-16 20:46:46.632 USER <username>
< 2012-07-16 20:46:46.692 331 Password required for <username>.
> 2012-07-16 20:46:46.692 PASS ********
< 2012-07-16 20:46:46.782 230-Directory has 964,639,358,976 bytes of disk space available.
< 2012-07-16 20:46:46.782 230 User logged in.
> 2012-07-16 20:46:46.782 SYST
< 2012-07-16 20:46:46.852 215 Windows_NT
> 2012-07-16 20:46:46.852 FEAT
< 2012-07-16 20:46:46.912 211-Extended features supported:
< 2012-07-16 20:46:46.912 LANG EN*
< 2012-07-16 20:46:46.912 UTF8
< 2012-07-16 20:46:46.922 AUTH TLS;TLS-C;SSL;TLS-P;
< 2012-07-16 20:46:46.922 PBSZ
< 2012-07-16 20:46:46.922 PROT C;P;
< 2012-07-16 20:46:46.922 CCC
< 2012-07-16 20:46:46.922 HOST
< 2012-07-16 20:46:46.922 SIZE
< 2012-07-16 20:46:46.922 MDTM
< 2012-07-16 20:46:46.922 REST STREAM
< 2012-07-16 20:46:46.922 211 END
> 2012-07-16 20:46:46.922 OPTS UTF8 ON
< 2012-07-16 20:46:46.982 200 OPTS UTF8 command successful - UTF8 encoding now ON.
. 2012-07-16 20:46:47.022 Connected
. 2012-07-16 20:46:47.022 Got reply 1 to the command 1
. 2012-07-16 20:46:47.022 --------------------------------------------------------------------------
. 2012-07-16 20:46:47.022 Using FTP protocol.
. 2012-07-16 20:46:47.022 Doing startup conversation with host.
> 2012-07-16 20:46:47.072 PWD
< 2012-07-16 20:46:47.142 257 "/<username>" is current directory.
. 2012-07-16 20:46:47.142 Got reply 1 to the command 16
. 2012-07-16 20:46:47.172 Getting current directory name.
. 2012-07-16 20:46:47.322 Retrieving directory listing...
> 2012-07-16 20:46:47.322 TYPE A
< 2012-07-16 20:46:47.332 200 Type set to A.
> 2012-07-16 20:46:47.332 PASV
. 2012-07-16 20:47:02.704 Timeout detected.
. 2012-07-16 20:47:02.704 Could not retrieve directory listing
. 2012-07-16 20:47:02.704 Got reply 1004 to the command 2
* 2012-07-16 20:47:02.844 (ESshFatal)

I guess there's a firewall rule blocking passive FTP. Although I tried the relevant netsh commands to enable that without success.

On a whim (I don't think I have EVER used anything but a PASV FTP connection), I unchecked the checkbox for passive FTP and now WinSCP working fine.