Artık posta sunucusuna bağlanılamıyor

Sunucu üzerinde postfix ve dovecot'a ait hiçbir şeye hiç dokunmadım. Ancak birkaç gün boyunca artık posta kutuma bağlanamıyorum.

/var/log/mail.log bağlanırken:

Sep 19 15:58:11 censored-hostname dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?1008074753?14732?1?6068faccfcf40bafc9d4bff43c24e74f
Sep 19 15:58:11 censored-hostname dovecot: imap: Error: Authentication server didn't send valid SPID as expected: MECH^IPLAIN^Iplaintext
Sep 19 15:58:11 censored-hostname dovecot: imap: Error: Disconnected from auth server, aborting (client-pid=14732 client-id=1)
Sep 19 15:58:11 censored-hostname dovecot: imap-login: Internal login failure (pid=14732 id=1) (auth failed, 1 attempts): user=<info@censored.com>, method=PLAIN, rip=censored-ip, lip=censored-ip, mpid=14733, TLS
Sep 19 15:58:11 censored-hostname dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?3226730497?14734?1?007240b93b5d5f7c244d11409e9b03e7
Sep 19 15:58:11 censored-hostname dovecot: imap: Error: Authentication server didn't send valid SPID as expected: MECH^IPLAIN^Iplaintext
Sep 19 15:58:11 censored-hostname dovecot: imap: Error: Disconnected from auth server, aborting (client-pid=14734 client-id=1)
Sep 19 15:58:11 censored-hostname dovecot: imap-login: Internal login failure (pid=14734 id=1) (auth failed, 1 attempts): user=<info@censored.com>, method=PLAIN, rip=censored-ip, lip=censored-ip, mpid=14735, TLS
Sep 19 15:58:12 censored-hostname dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?2949644289?14737?1?52378726316ead0da1733e3e2c8bb2ce
Sep 19 15:58:12 censored-hostname dovecot: imap: Error: Authentication server didn't send valid SPID as expected: MECH^IPLAIN^Iplaintext
Sep 19 15:58:12 censored-hostname dovecot: imap: Error: Disconnected from auth server, aborting (client-pid=14737 client-id=1)
Sep 19 15:58:12 censored-hostname dovecot: imap-login: Internal login failure (pid=14737 id=1) (auth failed, 1 attempts): user=<info@censored.com>, method=PLAIN, rip=censored-ip, lip=censored-ip, mpid=14738, TLS
Sep 19 15:58:13 censored-hostname dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?901382145?14739?1?cd9ac7c93707db11956f55a290b50005
Sep 19 15:58:13 censored-hostname dovecot: imap: Error: Authentication server didn't send valid SPID as expected: MECH^IPLAIN^Iplaintext
Sep 19 15:58:13 censored-hostname dovecot: imap: Error: Disconnected from auth server, aborting (client-pid=14739 client-id=1)
Sep 19 15:58:13 censored-hostname dovecot: imap-login: Internal login failure (pid=14739 id=1) (auth failed, 1 attempts): user=<info@censored.com>, method=PLAIN, rip=censored-ip, lip=censored-ip, mpid=14740, TLS

Dovecot konfigürasyonu:

# dovecot -n
# 2.0.19: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-042stab092.3 i686 Ubuntu 12.04.5 LTS reiserfs
first_valid_uid = 150
last_valid_uid = 150
mail_location = maildir:/var/vmail/%d/%n
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocols = " imap"
service auth {
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
  }
  unix_listener auth-userdb {
    group = mail
    mode = 0660
    user = vmail
  }
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  args = uid=150 gid=8 home=/var/vmail/%d/%n allow_all_users=yes
  driver = static
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
}

Sorun nedir ve nasıl düzeltilir? Posta sunucusunu yapılandırdığımdan yaklaşık 5 yıl önce.

Bazılarına göre , bu hata manuel olarak yeniden başlatılarak çözülebilir dovecotve bunun sizin için işe yaradığını anlıyorum.

Bununla birlikte, beş yıl boyunca yama yapılmayan hiçbir makinenin amaca uygun olduğu düşünülmemelidir. Bu kutuyu düzeltmenin tam zamanı!