Why is FTP blocked on MAC now?

In our office we have one MAC machine in which files are uploaded/downloaded to a FTP server via cyberduck.   It was working fine until about 2 weeks ago, and now cannot connect.  I've attempted to reboot the machine, run updates, updated cyberduck, even contacted ftp server admin (everything is fine on his end) and no progress.  When I do a telnet to the server with port 21 or ftp (server) on any other PC in the office it connects fine, but even doing that through a terminal window on the MAC, it does not.  Nothing on the machine, nor the rest of the network (plus works on other computers) for that matter has changed recently, so kinda lost where to go next.   I appreciate any help with this.  
Technical_SpecialistAsked:
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Technical_SpecialistConnect With a Mentor Author Commented:
Turns out it was a setting on the network firewall, blocking ssh.  Not sure why it only affected the MAC though.
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strungCommented:
Make sure the FTP settings are set for passive mode (PASV)
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Technical_SpecialistAuthor Commented:
They are
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strungCommented:
Have you checked the Mac's firewall?

Also, have you tried another FTP client, say, the free version of RBrowser:  http://macorchard.com/filetransfer/
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strungCommented:
Also, is your version of Tiger up to date? The last version was 10.4.11.
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Technical_SpecialistAuthor Commented:
Yes
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lesouefCommented:
check if the command line ftp works to isolate the cyberduck settings
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homepupCommented:
Try using /Applications/Utilities/Network Utility to do a port scan for port 21 on the server to check connection. Might also try moving the CyberDuck.plist file to let it recreate a new one in case the settings got hosed. Be sure to check both /Library/Preferences and ~/Library/Preferences.
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