it could also be that the FTP server isn't properly setup for passive mode or is behind a router.
I've setup Serv-U so many times I can practically do it in my sleep. Tell the ftp owner to try the following settings in Serv-U:
Go under Settings then click on the Advanced tab and under there he'll see a passive port range. If there is anything in there, tell him to clear it out. That way Serv-u will use any available ports for passive mode.
Then have him go under Domains then click on the Settings there, click on the Advanced tab. Enable 'Allow passive mode data transfers, use IP'
Where you would normally enter the internet IP of the server, instead leave that blank as well, if you enter an IP in there it can screw up the passive mode listings especially if the server has a dynamic ip.
Most tutorials don't tell you this, but i've never had a problem doing it this way and works quite well too if you're configuring a server behind a router as well.
sj
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