Error: systemd listens on port 993, but it's not configured in Dovecot.

[Florian Brucker]

Hallo,
ich versuche mich an der Installation von Dovecot auf einem Debian Jessie. In den Log-Files sehe ich regelmässig:
2016-01-15 17:33:35 master: Error: systemd listens on port 993, but it's not configured in Dovecot. Closing.
 
Der Systemd liefert:
systemctl status dovecot.socket
● dovecot.socket - Dovecot IMAP/POP3 email server activation socket
   Loaded: loaded (/lib/systemd/system/dovecot.socket; enabled)
   Active: active (running) since Fr 2016-01-15 17:33:35 CET; 22min ago
   Listen: 0.0.0.0:143 (Stream)
           [::]:143 (Stream)
           0.0.0.0:993 (Stream)
           [::]:993 (Stream)
 

systemctl status dovecot.socket
● dovecot.socket - Dovecot IMAP/POP3 email server activation socket
   Loaded: loaded (/lib/systemd/system/dovecot.socket; enabled)
   Active: active (running) since Fr 2016-01-15 17:33:35 CET; 23min ago
   Listen: 0.0.0.0:143 (Stream)
           [::]:143 (Stream)
           0.0.0.0:993 (Stream)
           [::]:993 (Stream)
 
Ich weiß nicht, wo ich den Port 993 für Dovecot explizit konfigieren muss. Ich meine, ich habe an den notwendigen Stellen den Port 993 verfügbar gemacht.
mail:/etc/dovecot # doveconf -N
# 2.2.13: /etc/dovecot/dovecot.conf
# OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.2
auth_debug = yes
auth_mechanisms = plain login
auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@
auth_verbose = yes
debug_log_path = /var/log/dovecot/dovecot-debug.log
dict {
  sqlquota = mysql:/etc/dovecot/dovecot-dict-sql.conf
}
disable_plaintext_auth = yes
info_log_path = /var/log/dovecot/dovecot-info.log
listen = *,[::]
log_path = /var/log/dovecot/dovecot.log
log_timestamp = "%Y-%m-%d %H:%M:%S "
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k
mail_debug = yes
mail_fsync = always
mail_gid = vmail
mail_home = /var/vmail/%d/%n
mail_location = mbox:~/mail:INBOX=/var/mail/%u
mail_nfs_index = yes
mail_nfs_storage = yes
mail_plugins = quota acl
mail_privileged_group = vmail
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 {
  list = yes
  location = maildir:%%h/:INDEXPVT=~/Shared/%%u
  prefix = Shared/%%u/
  separator = /
  subscriptions = yes
  type = shared
}
namespace inbox {
  inbox = yes
  location =
  mailbox Archiv {
    special_use = \Archive
  }
  mailbox Archive {
    auto = subscribe
    special_use = \Archive
  }
  mailbox Archives {
    special_use = \Archive
  }
  mailbox "Deleted Messages" {
    special_use = \Trash
  }
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Entwürfe {
    special_use = \Drafts
  }
  mailbox "Gelöschte Objekte" {
    special_use = \Trash
  }
  mailbox Gesendet {
    special_use = \Sent
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Papierkorb {
    special_use = \Trash
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix =
  separator = /
  subscriptions = yes
}
passdb {
  driver = pam
  name =
}
passdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
  name =
}
plugin {
  acl = vfile
  acl_anyone = allow
  acl_shared_dict = file:/var/vmail/shared-mailboxes.db
  quota = dict:User quota::proxy::sqlquota
  quota_rule2 = Trash:storage=+100%%
  sieve = /var/vmail/sieve/%u.sieve
  sieve_after = /var/vmail/sieve/global.sieve
  sieve_dir = ~/sieve
  sieve_max_script_size = 1M
  sieve_quota_max_scripts = 0
  sieve_quota_max_storage = 0
}
protocols = imap sieve lmtp pop3
recipient_delimiter = +
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-master {
    mode = 0600
    user = vmail
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0600
    user = vmail
  }
  user = root
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
  user = vmail
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
  process_min_avail = 2
  service_count = 1
  vsz_limit = 128 M
}
service managesieve {
  process_limit = 256
}
service pop3-login {
  inet_listener pop3 {
    port = 110
  }
  inet_listener pop3s {
    port = 995
    ssl = yes
  }
}
ssl = no
ssl_cert = </etc/ssl/mail/mail.crt
ssl_cipher_list = EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:+CAMELLIA256:+AES256:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!ECDSA:CAMELLIA256-SHA:AES256-SHA:CAMELLIA128-SHA:AES128-SHA
ssl_dh_parameters_length = 2048
ssl_key = </etc/ssl/mail/mail.key
ssl_protocols = !SSLv3 !SSLv2
userdb {
  driver = passwd
  name =
}
userdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
  name =
}
verbose_proctitle = yes
protocol lmtp {
  auth_socket_path = /var/run/dovecot/auth-master
  mail_plugins = quota sieve acl
  postmaster_address = postmaster at isp.de
}
protocol imap {
  mail_plugins = quota imap_quota imap_acl acl
}
protocol sieve {
  managesieve_logout_format = bytes=%i/%o
}
 
Vielleicht sieht jemand meinen Fehler. Ich bin gerade betriebsblind.
Grüße
Florian