Maybe I'm misunderstanding what you're saying, but I thought it was just the opposite. I thought active transfers used *only* ports 21 (control) and 20 (data) and that passive transfers used port 21 (control) and the next available port (data). Is this incorrect? (This is also how it is described at http://slacksite.com/other/ftp.html).
-Jeff -----Original Message----- From: Danny Mallory [mailto:[EMAIL PROTECTED]] Sent: Friday, January 31, 2003 08:49 AM To: sambar List Member Subject: [sambar] FTP Server {04} The issue is with your client, not the server.. Your client must instruct the server to utilizing the existing communications channels to perform its data transfers.. The technical term for this is called PASV.. This is a common issue when trying to utilize an FTP server behind a firewall.. By using the PASV(passive) option you will not attempt to make new port request. Danny On 30/Jan/2003 22:44:33, Tom Faulkner wrote: > FTP does use 20, as he said to start data transfers, it however > doesn't keep the transfer on 20. Just as you connect to port 21 on > the server it "transfers" your connection to another random port > number. Well, not entirely random. So if you connect to my ftp > server at port 21 it will answer and connect on port 4700 or > something. The same goes for port 20. This is so it can continue to > answer connections on the same port number, to allow for multiple > users. On the client end it will still appear to be port 21. > > And I think Passive mode works by the either the client or server > dynamically specify a data port rather than port 20. And if I > remember correctly Sambar supports passive only. Please feel free to > correct me on that. > > I'm not absolutely sure on all of that, but I'm fairly certain. > > Tom Faulkner > > -----Original Message----- > From: [EMAIL PROTECTED] [<A > HREF="mailto:[EMAIL PROTECTED]";>mailto:[EMAIL PROTECTED]</ > a>] On Behalf Of George Shaw > Sent: Friday, January 31, 2003 1:25 AM > To: sambar List Member > Subject: [sambar] FTP Server {02} > > I thought FTP used port 21 strictly myself > > George > > -----Original Message----- > From: [EMAIL PROTECTED] [<A > HREF="mailto:[EMAIL PROTECTED]";>mailto:[EMAIL PROTECTED]</ > a>] On Behalf Of Vital Touch DJs > Sent: Thursday, January 30, 2003 7:52 PM > To: sambar List Member > Subject: [sambar] FTP Server {01} > > Hey All, > > I have an update. > > I have checked in with my Network Administrator at the college that I > attend. I talked to him regarding the issue with the FTP. > > As he did say, FTP uses port 21 for Control, and port 20 to send > information out to the client. > > However, to recap, I have noticed that the Sambar Server will send > information out of ports usually starting with 4700 and for each > additional packet it sends out, it will increment the port by one.. so > the next data > sequence sent out would be on port 4701. > > He was informing me that most FTP servers have an option to send all > data out via port 20, or to send data out by this method of using high > ports. In > this case, Sambar Server does not have the function of being able to > choose > which port the data should be sent out of. > > Is this possibly something that could be worked on for the next > release or beta? I don't know, it isn't a big deal, but I would like > to block as many > ports as possible incoming and outgoing on my server, and right now I > have a > large hole to allow for data to be sent. > > Brian S ------------------------------------------------------- To unsubscribe please go to http://www.sambar.ch/list/
