Subj : FTP port 20 and QWK? wait...what?
To   : Rixter
From : Digital Man
Date : Tue Dec 17 2024 11:38 am

 Re: FTP port 20 and QWK? wait...what?
 By: Rixter to Digital Man on Tue Dec 17 2024 05:46 am

> > If your users are going to use "passive" FTP, then 2 connections need to
> > made to your system: the control connection (by default on port 21) and
> > the data connection (by default on whatever the control port number is,
> > minus one, so 20 by default).

> Thank you. I thought so. Should port 20 be set as tcp or udp? Or both in my
> router?

Just TCP is fine.

But I mispoke: for PASV FTP connections (used for most QWK packet transfers), the server data TCP port(s) are configurable and default to the range 1024-65535.

TCP port 20 is the default *source* port for *active* FTP data connections from the FTP server back to the client.

This web page explains how FTP uses ports and there are many like it:
https://www.techtarget.com/searchnetworking/tip/Understanding-the-FTP-PORT-command
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                                           digital man (rob)

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