[Akonadi] [Bug 317790] kmail triggers lots of "disconnected/no auth attempts" log entries in Dovecot

[Martti Laaksonen]

https://bugs.kde.org/show_bug.cgi?id=317790

--- Comment #4 from Martti Laaksonen <marduone at hotmail.com> ---
openSUSE 12.2
KDE 4.10.2

I recently upgraded my IMAP server from dovecot 1.2.17 to 2.1.7 and have been
following the mail logs much more frequently to find out possible upgrade
related configuration issues .

I too have noticed several times now how mail logs are filled with these 

imap-login: Disconnected (no auth attempts in 0 secs): user=<>,
rip=333.333.333.333, lip=444.444.444.44, TLS, session=<vN7z+mrc0QAKxcoM>

errors after dovecot had disconnected the akonadi IMAP session due to
inactivity.

Below is short excerpt from mail log from this morning (grep Disconnected
/var/log/mail|uniq -c -w 40):
      1 May 11 08:59:01 antique dovecot: imap(xxxxxxx): Disconnected for
inactivity in=10266 out=29478
      7 May 11 08:59:01 antique dovecot: imap-login: Disconnected (no auth
attempts in 0 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<vN7z+mrc0QAKxcoM>
     41 May 11 08:59:02 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<X2T3+mrc2AAKxcoM>
     47 May 11 08:59:03 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<N5gG+2rcAQAKxcoM>
     47 May 11 08:59:04 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<MOYV+2rcMAAKxcoM>
     45 May 11 08:59:05 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<h1Ml+2rcXwAKxcoM>
     47 May 11 08:59:06 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<x5E0+2rcjAAKxcoM>
     47 May 11 08:59:07 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<SeVD+2rcuwAKxcoM>
     47 May 11 08:59:08 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<UC1T+2rc6gAKxcoM>
     47 May 11 08:59:09 antique dovecot: imap-login: Disconnected (no auth
attempts in 1 secs): user=<>, rip=333.333.333.333, lip=444.444.444.444, TLS,
session=<dzhi+2rcGQAKxcoM>

I also checked older mail logs from before the dovecot upgrade and found
similar errors from those too, so I don't think it's a dovecot problem as such.

So, idle disconnect from dovecot side seems to cause akonadi to go to an
endless loop trying to connect several times every second.

Restarting dovecot "fixes" the problem for a while, but also seems to cause
some weird problems in Kontact/Kmail, like e.g. selecting some other folder
than inbox just hangs with folder icon being replaced with a busy icon (or
whatever it is called) and its contents is not shown.

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