wishmaster:
> Hi!
>
> I have strange behavior of Postfix (postfix-2.11.1_1,1)
>
> I use FreeBSD as base system and some jails. Each jail use
> virtual network stack (vnet). Problem is in latency when
> connection is outside from the base system only.
>
> telnet localhost 25 works fine, but if this connection or from
> jail or from LAN it is latency about 10 seconds before I see 220
> example.com.ua ESMTP Postfix
Is that 10 seconds to establish a TCP connection? The telnet client
looks up the destination host address, and your host may be configured
to query DNS before searching /etc/hosts. With a bad /etc/resolv.conf
file, or with bad firewalling/routing for DNS queries/replies, that
causes delays, typically a multiple of 5 seconds (RES_TIMEOUT=5).
Is that 10 seconds for Postfix to respond after TCP completes? This
is typically the result of a bad /etc/resolv.conf file, but may
also be caused by bad firewalling/routing for DNS queries/replies,
typically causing delays of a multiple of 5 seconds (RES_TIMEOUT=5).
So the proceduce is:
1) Disable chroot in master.cf (all columns 5 = "n") and "postfix
reload".
2) Check your /etc/resolv.conf.
3) Check your /etc/host.conf and /etc/nsswitch.conf.
Wietse
