User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.3a; MultiZilla v1.4.0.2) Gecko/20030312 Build Identifier: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.3a; MultiZilla v1.4.0.2) Gecko/20030312 I figured out that Mozilla is trying to retrieve data on different ports when using the file transfer protocol. The server I tried to access has a firewall, letting port 21 requests passing by, but mozilla requests has been dropped because it tried to get the data on ports like 17416. Even when I specified the port in the URL bar like ftp://user:password@host:21 Reproducible: Always Steps to Reproduce: 1. Accessing a file server with firewall, allowing port 21 requests 2. URL bar: ftp://user:password@host:21 3. Server shows dropped packets, Mozilla can't connect Expected Results: Accessing the server on port 21

This sounds very strange. You are sure your own firewall doesn't block server replies? Can you attach a sample of the ftp server-log?

btw.. mozilla should receive the data on any port. It is only the destination port you adress with port 21 in the URL.

FTP always uses two connections, a control one and a data one. This makes the firewall rules more complicated than for HTTP. Useful reference: http://slacksite.com/other/ftp.html Mozilla only supports passive FTP currently; aside from that, I don't think there is a bug here.

-> FTP

dupe of bug 465 (support active connections) *** This bug has been marked as a duplicate of 465 ***

Can you see if the server is accepting the PASV command? telnet host ftp USER anonymous PASS mozilla@example.org PASV (what does it say for that command?) We have separate bugs asking for error messages when a firewall breaks passive transfer.