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     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-th   
   -FTP-PORT-command   
   --    
                                               digital man (rob)   
      
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