Problem: My customer's server can put and get files over FTP to my production
server using IE, but can not do it over command line FTP. What is the
difference between IE and command line ftp traffic? The command line ftp
times out when we try to list files, yet when we do the same thing over IE it

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Command line FTP uses Active (PORT) mode FTP.

IE uses passive mode FTP.

In Active (PORT) mode, the FTP server creates data connections to a random
port on the client nominated by the client.

In Passive mode FTP, the FTP client creates data connections to a random
port on the server nominated by the server.

Either mode can have problems with NAT solutions and/or firewalls at either
end of the link. These problems arise from the design of the FTP protocol,
where the data connections are separate TCP connections to the control
connection on which FTP commands are given and received.

--
Robin Walker [MVP Networking]
rdhw@cam.ac.uk

That's werid, normally most users able to get command line works but not IE.
Anyway, check if you firewall block outbound port 20 for active mode data
port.

--
Regards,
Bernard Cheah
http://www.iis.net/
http://www.iis-resources.com/
http://msmvps.com/blogs/bernard/


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