Disconnected: Auth process broken (disconnected before auth was ready ... ???

30 May 2022


      I've been running dovecot 2.2.36.4 (baf9232c1) on my Debian-8 host for a
long time with no problems.
I am trying to move my email server to a Debian-11 host, and I have Dovecot
configured exactly the same way that I have it configured under Debian-8.
However, when I try to connect to that server via imap, I always get the
following error:
2022.05.30-18:17:21 imap-login: Info: Disconnected: Auth process broken
(disconnected before auth was ready, waited 0 secs): user=<>, rip=::1,
lip=::1, secured, session=<2+nKqj7g4t4AAAAAAAAAAAAAAAAAAAAB>
The output of "dovecot -n" appears at the bottom of this message.
I'm using mysql on the Debian-8 server for my authentication database, and
I'm using mariadb on the Debian-11 server. The contents of the database on
the new, Debian-11-based server are exactly the same as those on the
Debian-8 server.
These are the contents of /opt/local/etc/dovecot/dovecot-sql.ext with the
comments removed. I can manually run the following queries against the
database with a valid login ID, and these queries succeed ...
driver = mysql
connect = host=127.0.0.1 user=postfix password=XXXXXXXX dbname=postfix
default_pass_scheme = CRYPT
password_query = SELECT username AS user, domain, password FROM mailbox
WHERE (username = '%u' OR find_in_set('%u', loginid) > 0) AND active = 1
user_query = SELECT concat('/var/vmail/', maildir) AS home, 1003 AS uid,
1003 AS gid FROM mailbox WHERE (username = '%u' OR find_in_set('%u',
loginid) > 0) AND active = 1
Also ...
% ls -Flas /var/run/dovecot/auth-userdb
0 srw-rw-rw- 1 dovecot root 0 May 30 18:30 /var/run/dovecot/auth-userdb=
% ls -Flas /opt/local/etc/dovecot/dovecot-master-users-passwords
4 -rw-rw-r-- 1 root dovecot 36 Dec 16  2018
/opt/local/etc/dovecot/dovecot-master-users-passwords
% ls -Flas /opt/local/etc/dovecot/ad-hoc-userdb
4 -rw-rw-r-- 1 root root 416 May  7 14:53
/opt/local/etc/dovecot/ad-hoc-userdb
% ls -Flas /opt/local/etc/dovecot/dovecot-master-users-passwords
4 -rw-rw-r-- 1 root dovecot 36 Dec 16  2018
/opt/local/etc/dovecot/dovecot-master-users-passwords
When I start up dovecot, the following line appears at the bottom of
/var/log/mailclient.log ...
2022.05.30-18:31:37 master: Info: Dovecot v2.2.36.4 (baf9232c1) starting up
for imap, pop3, lmtp, imap, pop3 (core dumps disabled)
However, if I then run "telnet localhost 143", the following lines appear
at the end of /var/log/mailclient.log ...
2022.05.30-18:32:44 master: Error: service(auth): command startup failed,
throttling for 2 secs
2022.05.30-18:32:44 auth: Fatal: master: service(auth): child 235327 killed
with signal 11 (core dumps disabled)
2022.05.30-18:32:44 imap-login: Info: Disconnected: Auth process broken
(disconnected before auth was ready, waited 0 secs): user=<>, rip=::1,
lip=::1, secured, session=<8ezN4T7gJOAAAAAAAAAAAAAAAAAAAAAB>
The exact, same actions on my Debian-8 host do not fail.
And here is the output from "dovecot -n". As you can see, all "verbose" and
debug-related options are set to "yes". Thank you for any suggestions you
might be able to offer:
# 2.2.36.4 (baf9232c1): /opt/local/etc/dovecot/dovecot.conf
# OS: Linux 5.10.0-14-amd64 x86_64 Debian 11.3 ext4
# Hostname: my.hostname.com
auth_debug = yes
auth_debug_passwords = yes
auth_master_user_separator = :
auth_mechanisms = plain login
auth_socket_path = /var/run/dovecot/auth-userdb
auth_verbose = yes
auth_verbose_passwords = plain
base_dir = /var/run/dovecot/
disable_plaintext_auth = no
log_path = /var/log/mailclient.log
log_timestamp = "%Y.%m.%d-%H:%M:%S "
mail_debug = yes
mail_location = maildir:/var/vmail/%d/%n/
namespace inbox {
inbox = yes
list = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix = INBOX.
separator = .
}
passdb {
args = /opt/local/etc/dovecot/dovecot-master-users-passwords
driver = passwd-file
master = yes
pass = yes
}
passdb {
args = /opt/local/etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
passdb {
args = scheme=plain username_format=%u
/opt/local/etc/dovecot/ad-hoc-userdb
driver = passwd-file
}
plugin {
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
}
postmaster_address = postmaster@my.hostname.com
protocols = imap pop3 lmtp imap pop3
service imap-login {
inet_listener imap {
port = 143
}
inet_listener imaps {
port = 993
ssl = yes
}
}
service imap {
executable = imap postlogin
}
service pop3 {
executable = pop3 postlogin
}
service postlogin {
executable = script-login -d rawlog
}
ssl_cert = </etc/letsencrypt/live/my.hostname.com/fullchain.pem
ssl_cipher_list = HIGH:!SSLv2:!aNULL@STRENGTH
ssl_client_ca_dir = /etc/ssl/certs
ssl_client_ca_file = ca-certificates.crt
ssl_key =  # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
userdb {
args = /opt/local/etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
userdb {
args = scheme=plain username_format=%u
/opt/local/etc/dovecot/ad-hoc-userdb
driver = passwd-file
}
protocol imap {
mail_max_userip_connections = 128
}
--
hippoman@gmail.com
Take a hippopotamus to lunch today.

Hippo Man

Hippo Man

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