ncftpd on fc3 malfunctioning?

[Thomas Cameron]

On Wed, 2005-06-15 at 11:35 -0700, kristina clair wrote:
> On 6/15/05, Alexander Dalloz <ad+lists at uni-x.org> wrote:
> > Am Mi, den 15.06.2005 schrieb kristina clair um 19:46:
> >
> > > Has anyone else had any problems with some ftp clients and ncftpd on
> > > fc3?  We upgraded some of our servers from redhat 7.3 to fc3, and
> > > several popular windows ftp clients encounter connection errors when
> > > connecting to the fc3 servers, but not to the redhat 7.3 servers.  My
> > > command-line ftp client works fine for both.
> >
> > > Kristina
> >
> > Any chance it is a firewalling / iptables problem - you checked that?
> >
> > http://www.ncftp.com/ncftpd/doc/faq/trouble.html
> > -->
> > Users are unable to login.  How do I diagnose the problem?
> >
> > Alexander
> 
> If it were a firewall problem, shouldn't ALL connections be refused?
> I'm always able to connect from the command line ftp on my personal
> computer.

No - ftp uses two ports, 20 and 21, and it uses tcp and udp on one port
but not the other (I never can remember which is which, 20 or 21).  So
unless your iptables rules allow 20/tcp, 20/udp, 21/tcp and 21/udp, you
might get a funky, incomplete connection that won't allow, say passive
connections.