See NATing comment below.
Bill
On 10/20/2017 5:24 AM, S?ren Peter Skou wrote:> Hiya all,
>
> I've experienced that IMAP/IMAPS stops responding. To restore service
there is only one way, restart Dovecot completely. This leads to services being
interrupted for some people, so it seems to only affect some of the users on the
server. But POP3/POP3s is still running happily. Also, it happens more as we
approach Rush Hour. All of this leads me to believe that we're facing a
problem with clients somehow. I've searched the net for the problem, and
dating back I've found references to Apple units being the culprit. So
we've taken an old Apple client, and tried to see how many sessions it
actually starts, the result of that test was that regardless what we tried it
only opened one extra session.
>
> A bit of information, Debian OS :
> dovecot-core 2:2.2.27-1~auto+44 amd64
secure POP3/IMAP server - core files
> dovecot-imapd 2:2.2.27-1~auto+44 amd64
secure POP3/IMAP server - IMAP daemon
> dovecot-mysql 2:2.2.27-1~auto+44 amd64
secure POP3/IMAP server - MySQL support
> dovecot-pop3d 2:2.2.27-1~auto+44 amd64
secure POP3/IMAP server - POP3 daemon
> dovecot-sieve 2:2.2.27-1~auto+44 amd64
secure POP3/IMAP server - Sieve filters support
>
> the Config itself is fairly simple, lookup through MySQL to find
username/password etc - I don't really see any obvious option. Also,
limiting users/sessions per IP isn't really a good idea as we have a great
deal of customers behind NAT.
NATing shouldn't matter.? The way I understand mail_max_userip_connections,
it is per user and IP.? Therefore
(the default being mail_max_userip_connections=10), bob, sally, and tom will
each get 10 connections
from the same IP address.> Med venlig hilsen/Best regards
>
> S?ren P. Skou
> Netv?rkstekniker
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