[Dovecot] Error: doveadm client attempted non-PLAIN authentication

[Daniel Parthey]

Hi

doveadm search -u user at example.org -S localhost:19000 all
produces the following error in the logs:
dovecot: doveadm: Error: doveadm client attempted non-PLAIN authentication

What am I missing?

* tcpdump of tcp communication on port 19000 is attached
* dovecot.conf is attached

Regards
Daniel
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# 2.0.20: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-40-server x86_64 Ubuntu 10.04.4 LTS 
auth_cache_negative_ttl = 0
auth_cache_size = 10 M
auth_cache_ttl = 1 mins
auth_verbose = yes
auth_verbose_passwords = sha1
deliver_log_format = mailbox: deliver: msgid=%m from=%f: %$
dict {
  quota = mysql:/etc/dovecot/conf.d/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
doveadm_password = bf79a088601795554d6d428ece2ea92a1c91ae11
instance_name = dovecot-mailbox
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
login_greeting = Mailbox
login_log_format = mailbox: login: %$: %s
login_trusted_networks = 10.129.3.0/24
mail_debug = yes
mail_fsync = always
mail_gid = vmail
mail_home = /mail/dovecot/%d/%n
mail_location = mdbox:~/mail
mail_log_prefix = "mailbox: mail: %s(%u): "
mail_plugins = quota
mail_privileged_group = vmail
mail_uid = vmail
managesieve_implementation_string = Sieve
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave
mdbox_rotate_interval = 1 weeks
mdbox_rotate_size = 50 M
mmap_disable = yes
passdb {
  args = /etc/dovecot/conf.d/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  quota = dict:User quota::proxy::quota
  quota_rule = *:storage=10G
  quota_rule2 = Trash:storage=+100M
  quota_warning = storage=95%% quota-warning 95 %u
  quota_warning2 = storage=80%% quota-warning 80 %u
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve
}
protocols = imap pop3 lmtp sieve
service auth {
  unix_listener auth-userdb {
    group = dovecot
    mode = 0660
    user = dovecot
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
  }
}
service doveadm {
  inet_listener doveadm-server {
    port = 19000
  }
}
service imap-login {
  inet_listener imap {
    port = 19143
  }
}
service imap-postlogin {
  executable = script-login /usr/local/bin/dovecot-postlogin
  user = $default_internal_user
}
service imap {
  executable = imap imap-postlogin
}
service lmtp {
  inet_listener lmtp {
    address = *
    port = 19024
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 19200
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 19110
  }
}
service pop3-postlogin {
  executable = script-login /usr/local/bin/dovecot-postlogin
  user = $default_internal_user
}
service pop3 {
  executable = pop3 pop3-postlogin
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning
  extra_groups = dovecot
  unix_listener quota-warning {
    user = vmail
  }
  user = vmail
}
ssl = no
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/conf.d/dovecot-sql.conf.ext
  driver = sql
}
verbose_proctitle = yes
protocol imap {
  imap_client_workarounds = delay-newmail tb-extra-mailbox-sep
  mail_plugins = quota imap_quota
}
protocol lmtp {
  mail_plugins = quota sieve
}