Author: Tim Jackson Date: To: exim-users Subject: Re: [Exim] Dealy in getting connected to Exim from remote
mailservers
Hi Dilip, on Thu, 26 Feb 2004 16:33:49 +0530 you wrote:
> Whenever i try to telnet to my Exim mailserver (from remote
> mailserver)it takes some 40 seconds delay to get connected.
This comes up quite often.
It's quite possibly the RFC1413 ident lookup. By default, this is turned
on, and the timeout is set to 30 seconds. If you try to connect to your
Exim server from behind an unhelpful firewall that drops packets it
doesn't like on the floor, then you will naturally experience this delay.
Possible solutions:
- live with it: any "real" connecting host affected by this should
hopefully wait more than 30 seconds before giving up.
- fix the firewall, if it's yours
- look at the the rfc1413_* options in the Exim spec and/or default config
file. You could disable ident lookups altogether, or set a shorter timeout
(which is what I do). In particular:
rfc1413_hosts lets you set which hosts to perform ident lookups for
rfc1413_query_timeout sets the timeout (zero to disable lookups)
