dovecot: config: Error: BUG: Config client connection sent too much data

[Aki Tuomi]

> On August 25, 2017 at 9:11 AM Tony <tony at kode.email> wrote:
> 
> 
> Hello,
> 
> Today I started noticing a very odd Dovecot error in the mail logs
> across 2 replicated Dovecot hosts via dsync. I have searched the Dovecot
> archives, Google, back tracked, downgraded Dovecot to earlier versions
> from earlier this year and ruled everything out I could think of to no
> avail. There really are not any helpful reports with what I am
> specifically seeing. The strange thing is only vmail at domain.net is
> repeatedly shown in the log. The error looks like this.
> 
> *Aug 24 22:46:02 orbitron dovecot: config: Error: BUG: Config client
> connection sent too much data****Aug 24 22:46:02 orbitron dovecot:
> doveadm(vmail at domain.net@domain.net at domain.net@domain.net at domain.net@domain.net at domain.net@domain.net at domain.net):
> Fatal: Error reading configuration: read(/var/run/dovecot/config)
> failed: read(size=8192) failed: Connection reset by peer***
> $ dovecot --version
> 2.2.31 (65cde28) 
> 
> Dovecot #1: Linux kernel 4.9.36-x86_64
> Dovecot #2: Linux kernel 4.12.8-x86_64
> 
> Here are the latest Dovecot updates performed this year.
> 
> [2017-04-29 14:45] [ALPM] upgraded dovecot (2.2.28-2 -> 2.2.28-3)
> [2017-05-02 23:05] [ALPM] upgraded dovecot (2.2.28-3 -> 2.2.29.1-1)
> [2017-06-11 17:20] [ALPM] upgraded dovecot (2.2.29.1-1 -> 2.2.30.2-1)
> [2017-06-30 22:46] [ALPM] upgraded dovecot (2.2.30.2-1 -> 2.2.31-1)
> 
> When Dovecot was last updated back on June 30, I did `systemctl
> daemon-reload` but never actually restarted the Dovecot daemon until
> what seems like today. The only thing I did today was edit
> /etc/dovecot/conf.d/10-auth.conf by simply enabling
> "*auth_username_format = %Lu*" which was commented out before I enabled
> it. That is the /*only*/ thing that I tested. After I was done testing I
> went back and commented out the same thing so it reads
> "*#auth_username_format = %Lu*" and of course restarted Dovecot. I
> really doubt this has anything to do with what I am reporting as auth is
> not the problem in this case.
> 
> 
> Thank You,
> 
> Tony
>

Can you provide doveconf -n.

Also auth_username_format=%Lu*, why *?

Aki</tony at kode.email>