dovecot - Dec 2013 - disconnecting (disconnected by server)

Hi all,

I just recognized a lot of log entries like this on my proxy:

Dec 03 13:50:54 imap-login: Info: proxy(mail at example.com): disconnecting 
1.2.3.4 (Disconnected by server): user=<mail at example.com>,
method=PLAIN,
rip=1.2.3.4, lip=2.4.6.8, TLS, session=<qk02v6DsJwBTlUQX>

There are no similar entries on the backends.

What does this mean? Something I have to worry about?

Regards
Patrick




# 2.2.7: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.2
auth_mechanisms = plain login
default_process_limit = 150
director_mail_servers = 172.17.1.2 172.17.1.1
director_servers = 172.17.1.3 172.17.1.4
director_user_expire = 5 mins
lmtp_proxy = yes
log_path = /var/log/dovecot.log
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
protocols = imap pop3 lmtp sieve
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0666
     user = postfix
   }
   unix_listener auth-userdb {
     user = dovecot
   }
}
service director {
   fifo_listener login/proxy-notify {
     mode = 0666
   }
   inet_listener {
     address = 172.17.1.3
     port = 9090
   }
   unix_listener director-userdb {
     mode = 0600
   }
   unix_listener login/director {
     mode = 0666
   }
}
service imap-login {
   executable = imap-login director
}
service lmtp {
   inet_listener lmtp {
     address = 172.17.1.3
     port = 24
   }
}
service managesieve-login {
   executable = managesieve-login director
   inet_listener sieve {
     port = 4190
   }
}
service pop3-login {
   executable = pop3-login director
}
ssl_cert = </etc/ssl/certs/wildcard.example.com.crt
ssl_key = </etc/ssl/private/wildcard.example.com.key
protocol !smtp {
   passdb {
     args = proxy=y nopassword=y starttls=any-cert
     driver = static
   }
}
protocol smtp {
   passdb {
     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
     driver = sql
   }
   userdb {
     args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
     driver = sql
   }
}
protocol lmtp {
   auth_socket_path = director-userdb
}



# 2.2.2: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.1
auth_mechanisms = plain login
disable_plaintext_auth = no
dotlock_use_excl = no
hostname = mb01.example.com
listen = 172.17.1.1
log_path = /var/log/dovecot.log
login_trusted_networks = 172.17.1.3 172.17.1.4
mail_fsync = always
mail_gid = vmail
mail_home = /var/mail/%d/%n
mail_location = maildir:~/Maildir
mail_plugins = quota
mail_uid = vmail
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
mmap_disable = yes
namespace inbox {
   inbox = yes
   location    mailbox Drafts {
     auto = subscribe
     special_use = \Drafts
   }
   mailbox Junk {
     special_use = \Junk
   }
   mailbox Sent {
     auto = subscribe
     special_use = \Sent
   }
   mailbox Spamverdacht {
     auto = subscribe
   }
   mailbox Trash {
     auto = subscribe
     special_use = \Trash
   }
   prefix = INBOX.
   separator = .
   type = private
}
passdb {
   args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   quota = dict:User quota::file:%h/Maildir/dovecot-quota
   quota_rule2 = INBOX.Trash:ignore
   quota_warning = storage=90%% quota-warning 90 %u
   quota_warning2 = storage=75%% quota-warning 75 %u
   sieve = ~/.dovecot.sieve
   sieve_after = /usr/local/etc/dovecot/sieve/sieve_after.sieve
   sieve_default = /usr/local/etc/dovecot/sieve/default.sieve
   sieve_dir = ~/sieve
}
postmaster_address = postmaster at example.com
protocols = imap pop3 lmtp sieve
service auth {
   unix_listener auth-userdb {
     mode = 0666
     user = vmail
   }
}
service lmtp {
   inet_listener lmtp {
     address = 172.17.1.1
     port = 24
   }
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
}
service quota-warning {
   executable = script /usr/local/etc/dovecot/quota_warning.sh
   unix_listener quota-warning {
     user = vmail
   }
   user = root
}
ssl_cert = </etc/ssl/certs/mb01.example.com.crt
ssl_key = </etc/ssl/private/mb01.example.com.key
submission_host = mf01.wk-serv.net
userdb {
   args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
protocol lmtp {
   mail_plugins = quota sieve
}
protocol imap {
   mail_max_userip_connections = 30
   mail_plugins = quota imap_quota
}

On 3.12.2013, at 14.55, Patrick Westenberg <pw at wk-serv.de> wrote:
> I just recognized a lot of log entries like this on my proxy:
> 
> Dec 03 13:50:54 imap-login: Info: proxy(mail at example.com): disconnecting
1.2.3.4 (Disconnected by server): user=<mail at example.com>,
method=PLAIN, rip=1.2.3.4, lip=2.4.6.8, TLS, session=<qk02v6DsJwBTlUQX>
> 
> There are no similar entries on the backends.
> 
> What does this mean? Something I have to worry about?
See the session ID ?qk02v6DsJwBTlUQX?. Find the disconnection message from the
backend server?s logs by grepping it.