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 > CCNP, CCNA, MCP > [EMAIL PROTECTED] > > -----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 > <A TARGET="_blank" HREF="http://www.vtdj.com";>http://www.vtdj.com</a> > ------------------------------------------------------- > To unsubscribe please go to <A TARGET="_blank" >HREF="http://www.sambar.ch/list/";>http://www.sambar.ch/list/</a> > ------------------------------------------------------- > To unsubscribe please go to <A TARGET="_blank" >HREF="http://www.sambar.ch/list/";>http://www.sambar.ch/list/</a> > > --- > Incoming mail is certified Virus Free. > Checked by AVG anti-virus system (<A TARGET="_blank" >HREF="http://www.grisoft.com";>http://www.grisoft.com</a>). > Version: 6.0.449 / Virus Database: 251 - Release Date: 1/27/2003 > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (<A TARGET="_blank" >HREF="http://www.grisoft.com";>http://www.grisoft.com</a>). > Version: 6.0.449 / Virus Database: 251 - Release Date: 1/27/2003 > > ------------------------------------------------------- > To unsubscribe please go to <A TARGET="_blank" >HREF="http://www.sambar.ch/list/";>http://www.sambar.ch/list/</a> > > > ------------------------------------------------------- To unsubscribe please go to http://www.sambar.ch/list/
