The client machine is running FileZilla and has no firewall.

And I cannot get it to work. As of now, I'm up to the point of being able to hit the site, and login. When I get to the point of sending LIST, things stop working.  The error seems to depend on which ports are opened on the server.

With 990 open inbound and outbound, and 20 open outbound, LIST churns until it hits whatever value I give FileZilla as the timeout setting, and then returns a timeout error. The WS_FTP log shows a failure because 'the connected party did not properly respond after a period of time, or established connection failed because host has failed to respond.'

With 990 open inbound and outbound, and 989 open outbound (suggested by WS_FTP support as being the way to do things with implicit SSL), LIST errors out quickly - the log shows a failure due to the target machine actively refusing it.

I've also tried 990 open inbound and outbound, and ports > 1024 open outbound - also a quick failure due to target machine refusing it.

I've also played around sending some raw commands to the server. While I can make directories to my heart's content, LIST and STOR - which are the commands that are actually of use to me - fail.

I've been back and forth with WS_FTP support on this for several months. Each time I get a slightly different suggestion for which ports need to be opened. None have worked. So, anyone out there have any experience in dealing with this sort of thing, who might have some ideas?

<?xml version="1.0" encoding="utf-8" ?>
<log>
 

  <entry>
    <log_time>20081219-08:21:21</log_time>
    <description><![CDATA[Connection established]]></description>
    <service>FTP</service>
    <sessionid>04032828</sessionid>
    <type>0</type>    <severity>0</severity>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.64.152.87:2371</cliconnaddr>
    <cmd>start</cmd>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

  <entry>
    <log_time>20081219-08:21:25</log_time>
    <description><![CDATA[SSL version info: version=TLSv1/SSLv3:cipher=AES128-SHA:strength=128]]></description>
    <service>FTP/SSL</service>
    <sessionid>04032828</sessionid>
    <type>0</type>    <severity>0</severity>
    <user>admin</user>
    <host>192.168.50.19</host>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.64.152.87:2371</cliconnaddr>
    <cmd>USER</cmd>
    <params><![CDATA[admin]]></params>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

  <entry>
    <log_time>20081219-08:21:26</log_time>
    <description><![CDATA[logon success (admin)]]></description>
    <service>FTP/SSL</service>
    <sessionid>04032828</sessionid>
    <type>1</type>    <severity>1</severity>
    <user>admin</user>
    <host>192.168.50.19</host>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.64.152.87:2371</cliconnaddr>
    <cmd>PASS</cmd>
    <params><![CDATA[*****]]></params>
    <errnum>220</errnum>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

  <entry>
    <log_time>20081219-08:21:53</log_time>
    <description><![CDATA[socket exception A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 12.64.152.87:6452,    at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
   at SSHServerAPI.Transport.FTPTransport._OnDCConnect(IAsyncResult ar)]]></description>
    <service>FTP/SSL</service>
    <sessionid>04032828</sessionid>
    <type>4</type>    <severity>3</severity>
    <user>admin</user>
    <host>192.168.50.19</host>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.64.152.87:2371</cliconnaddr>
    <cmd>LIST</cmd>
    <errnum>10060</errnum>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

  <entry>
    <log_time>20081219-12:40:29</log_time>
    <description><![CDATA[Connection established]]></description>
    <service>FTPS</service>
    <sessionid>33711845</sessionid>
    <type>0</type>    <severity>0</severity>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.65.114.115:4134</cliconnaddr>
    <cmd>start</cmd>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

  <entry>
    <log_time>20081219-12:40:29</log_time>
    <description><![CDATA[SSL version info: version=TLSv1/SSLv3:cipher=AES128-SHA:strength=128]]></description>
    <service>FTPS</service>
    <sessionid>33711845</sessionid>
    <type>0</type>    <severity>0</severity>
    <user>admin</user>
    <host>192.168.50.19</host>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.65.114.115:4134</cliconnaddr>
    <cmd>USER</cmd>
    <params><![CDATA[admin]]></params>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

  <entry>
    <log_time>20081219-12:40:29</log_time>
    <description><![CDATA[logon success (admin)]]></description>
    <service>FTPS</service>
    <sessionid>33711845</sessionid>
    <type>1</type>    <severity>1</severity>
    <user>admin</user>
    <host>192.168.50.19</host>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.65.114.115:4134</cliconnaddr>
    <cmd>PASS</cmd>
    <params><![CDATA[*****]]></params>
    <errnum>220</errnum>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

  <entry>
    <log_time>20081219-12:40:32</log_time>
    <description><![CDATA[socket exception No connection could be made because the target machine actively refused it 12.65.114.115:6278,    at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
   at SSHServerAPI.Transport.FTPTransport._OnDCConnect(IAsyncResult ar)]]></description>
    <service>FTPS</service>
    <sessionid>33711845</sessionid>
    <type>4</type>    <severity>3</severity>
    <user>admin</user>
    <host>192.168.50.19</host>
    <lstnconnaddr>192.168.50.19:990</lstnconnaddr>
    <cliconnaddr>12.65.114.115:4134</cliconnaddr>
    <cmd>LIST</cmd>
    <errnum>10061</errnum>
    <sguid>28C90A6E-42C0-41DB-2C96-33EF5BC01106</sguid>
  </entry>

</log>