From: John Belmonte [mailto:jo...@neggie.net]
I'm using Courier 0.42.2. My email client was showing a symptom of a
long delay (30-40 seconds) when connecting to a Courier SMTP server.
I've tracked this delay down to the SMTP server. If you just telnet
to the server, the delay happens between the initial connection and
when the server sends the "220 machine.example.net ESMTP" message.
The puzzling thing is that the delay only occurs when I telnet from my
local network. Testing from two locations outside my network, there
is no delay. The only difference I notice is that the address of my
local network is not ping-able from the internet, while the other
locations I tested are.
I've compared the strace output of the SMTP server for the two cases.
In the bad case, some connection attempt is timing out. In the good
case, that connection attempt is being refused immediately. Anyone
know what's going on?
It looks like an ident lookup (port 113). In the good case it is being
rejected by
either a firewall or the target machine. In the bad case, the request
is just being ignored (probably by a firewall).
The solution is to either disable ident lookups, or fix the firewall to
either accept or reject these requests rather than just dropping them.
I disabled ident lookups on my server, but I can't seem to figure out
where I did it. Maybe someone else can tell you how.
Bowie
6 messages in net.sourceforge.lists.courier-usersRE: [courier-users] connection to cou...