Subj : FTP port 20 and QWK? wait...what?
To   : Rixter
From : Digital Man
Date : Tue Dec 17 2024 11:38:23

  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
-- 
                                            digital man (rob)

Breaking Bad quote #52:
I need to get involved like I need a second hole in my ass - Hank Shrader
Norco, CA WX: 73.6øF, 27.0% humidity, 1 mph SE wind, 0.00 inches rain/24hrs
--- SBBSecho 3.23-Linux
 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

.