[Dovecot] Connection queue full on dovecot 2.0.13

Timo Sirainen
Tue, 03 Apr 2012 14:43:50 -0000

On Mon, 2012-04-02 at 16:39 +0200, Giovanni Mancuso
wrote:
> Apr 02 14:34:36 imap-login: Info: Disconnected: *Connection queue full
> *(auth failed, 1 attempts): user=<//user at example.com/

This means you've reached the process_limit/client_limit.

> I see this wiki page: http://wiki2.dovecot.org/LoginProcess but i read:
>
> It works by using a number of long running login processes, each
> handling a number of connections. This loses much of the security
> benefits of the login process design, because in case of a security hole
> (in Dovecot or SSL library) the attacker is now able to see other users
> logging in and steal their passwords, read their mails, etc.
>
> Is there another way?

Just increase the number of processes:

service imap-login {
  process_limit = 10000
}