Re: [Proftpd-user] Directory listing fails

> Unfortunately not, as I don't have a specific example off the top of my 
> head.  I do know we've had clients request PureFTPd's preferences be set 
> to display a larger number of files in the past.

OK.  The reason I ask is that you mentioned that you had not explicitly
set any ProFTPD's timeout directives (TimeoutIdle, TimeoutStalled,
TimeoutNoTransfer, etc).  And you mentioned that now, you are seeing
"Remote host has closed the connection." after 60 seconds.

None of ProFTPD's timeouts have a default setting of 60 seconds.  Which
makes it curious what could be causing this.  The ProFTPD debug logging
would show if the above 60 second loss of connectivity was, in fact,
caused by some timeout.  If not, then it would suggest that something in
between the client and the server is closing the connection.

I've seen this sort of thing happen before, with FTP-unaware
firewalls/NAT, which would close the FTP control connection for being
idle (whilst the client was waiting for traffic on the separate data
connection); such network middleboxes don't know to associate FTP's
separate control and data TCP connections together.

Now if _this_ is the case, making it work with ProFTPD becomes a little
harder -- and more likely to cause other problems with FTP clients.  For
it would mean that ProFTPD would need to "trickle" data on the control
connection -- an on-going multiline response for the LIST command, in
order to keep that control connection alive.  And I'm not sure how well
FTP clients would react to that sort of thing, in that situation.

So right now, it looks like it's either a) a ProFTPD timeout that you're
unaware of, somewhere in your config, which is causing the connection to
close, or b) it's something in the network.  And we'll need more data
(e.g. the proftpd debug logging) to be sure.  If you'd had this working
with a different FTP server, we could compare the transcripts and see
what that server might be doing differently (was it trickling responses
on the control connection, for example?  Was the client in question
using FTP keepalives[1]? etc).

Cheers,
TJ

1. http://www.proftpd.org/docs/howto/KeepAlives.html


------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
_______________________________________________
ProFTPD Users List   <[email protected]>
Unsubscribe problems?
http://www.proftpd.org/list-unsub.html