425 cannot open data connection

I am receiving this error message when attempting to pass commands to the FTP account.  This account is using explicit SSL.  I have verified that all of the necessary ports are open and have switched between both passive and non-passive modes without success.  I have attempted this connection from both WS_FTP and SmartFTP clients.  I have followed all of the steps in the following article without success:

Any ideas?


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giltjrConnect With a Mentor Commented:
Is there a firewall between the client and the server?

Do these support Extended Passive mode? If so try it.  If they don't then you will need to configure the server to use a specific range of ports for the data connections, configure the firewall to allow this range of ports through, and use passive FTP.
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