Re: [exim] Exim 4.88: LMTP over TCP timeouts

On 07/03/17 09:28, Peter Rindfuss wrote:
> We are using Exim 4.88 on Debian with a non-Debian config. We deliver to
> our mailboxes on a separate Dovecot IMAP machine using LMTP over TCP
> (SMTP transport). A few times a day we see "Connection timed out" on the
> transport. It strikes me as odd that the time between the reception of a
> message and the delivery timeout is typically around 20 seconds, whereas
> all timeout values are at their defaults, which is 5 minutes for
> connect, command and data. Any ideas on this?

A shorter system-level timeout may be being applied, firing before
the Exim one. Have a look around /proc/sys/net/ipv4 for values
such as "tcp_syn_retries".
--
Cheers,
Jeremy