[Dovecot] pop3-login problem

[Oleksii Krykun]

27.09.2013 17:52, Timo Sirainen <tss at iki.fi>
>On 27.9.2013, at 11.31, Oleksii Krykun <kryol at bigmir.net> wrote:
> 
> > I have dovecot-2.2.5 installed as part of postfix+dovecot+mysql+amavisd.
> > My server has two NICs (Internet and local). /etc/resolv.conf point to ISP DNS. Local names are not resolved.
> > 
> > If ISP link goes to down state I see (after about 1minute) a following error:
> > 
> > Sep 26 15:44:29 pop3-login: Error: master(pop3): Auth request timed out (received 0/12 bytes)
> 
> auth process is hanging.
> 
> > and following informational message:
> > 
> > Sep 26 15:44:29 pop3-login: Info: Internal login failure (pid=12809 id=17815) (internal failure, 1 successful auths): user=<xxx at xxx.xxx> .....
> > 
> > If link is restored (even for a short time) all works fine again. After next down errors are repeated.
> > 
> > I suppose that this is dns issue. Am I wrong?
> 
> Could be.
> 
> > And I have a following question.
> > Is it possible to disable dns requests? I haven't external clients. Or I must fix a name resolution e.g. to use a caching dns server?
> 
> Dovecot doesn't do DNS requests itself, exactly because of problems like these. Your passdb or userdb might do that though. Show your doveconf -n?

My doveconf -n:


# 2.2.5: /usr/local/etc/dovecot/dovecot.conf
# OS: FreeBSD 8.4-RELEASE i386  ufs
auth_mechanisms = plain login cram-md5
auth_verbose = yes
auth_verbose_passwords = plain
dict {
  expire = mysql:/usr/local/etc/dovecot/dovecot-dict-expire.conf.ext
}
first_valid_gid = 1991
first_valid_uid = 1991
info_log_path = /var/log/dovecot-info.log
log_path = /var/log/dovecot.log
login_greeting = Welcome to IMAP/POP3 server
login_trusted_networks = 127.0.0.0/8, 10.1.1.0/24
mail_location = maildir:/usr/local/mail/%d/%u
mail_plugins = quota expire
mail_privileged_group = mail
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 vnd.dovecot.duplicate
namespace inbox {
  inbox = 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 =
}
passdb {
  args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  expire = Trash
  expire2 = Trash/*
  expire3 = Spam
  expire_dict = proxy::expire
  quota = maildir:User quota
  quota_warning = storage=95%% quota-warning 95 %u
  sieve = ~/.dovecot.sieve
  sieve_before = /usr/local/etc/dovecot/sieve/before.sieve
  sieve_dir = ~/sieve
  sieve_extensions = +vnd.dovecot.duplicate
  sieve_global_dir = /usr/local/etc/dovecot/sieve
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-userdb {
    group = virtual
    mode = 0666
    user = virtual
  }
}
service dict {
  unix_listener dict {
    mode = 0600
    user = virtual
  }
}
service imap-login {
  process_min_avail = 5
  service_count = 0
}
service pop3-login {
  service_count = 0
}
service quota-warning {
  executable = script /usr/local/etc/dovecot/quota-warning.sh
  unix_listener quota-warning {
    user = virtual
  }
  user = dovecot
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol lda {
  mail_plugins = quota expire sieve
}
protocol imap {
  imap_client_workarounds = delay-newmail tb-extra-mailbox-sep tb-lsub-flags
  mail_plugins = quota expire imap_quota
}
protocol pop3 {
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh