[Dovecot] No ports listening

[Marco]

Please forgive my newbie post but this has me stumped.  I've been a happy
Dovecot 0.X and 1.X admin for years but something in my first 2.X
configuration is oddly broken.  It loads fine, logs no errors, but
doesn't listen to any network ports!  Thanks in advance for any help.

Marco


  # 2.0.19: /etc/dovecot/dovecot.conf
  # OS: Linux 2.6.35.14 x86_64 Ubuntu 10.10 ext4
  auth_debug = yes
  auth_mechanisms = plain login
  first_valid_gid = 111
  first_valid_uid = 111
  login_greeting = example.com pop/imap ready
  mail_location = mbox:/var/mail/%u.imap:INBOX=/var/mail/%u
  passdb {
    args = scheme=CRYPT username_format=%u /etc/dovecot/users
    driver = passwd-file
  }
  service auth {
    unix_listener /var/spool/postfix/private/auth {
      group = postfix
      mode = 0660
      user = postfix
    }
    unix_listener auth-master {
      mode = 0666
    }
  }
  service imap-login {
    inet_listener imap {
      address = *
      port = 143
    }
    inet_listener imaps {
      address = *
      port = 993
    }
    process_limit = 50
  }
  service pop3-login {
    inet_listener pop3 {
      address = *
      port = 110
    }
    inet_listener pop3s {
      address = *
      port = 995
    }
    process_limit = 50
  }
  ssl_cert = </etc/ssl/mail.example.com.crt
  ssl_key = </etc/ssl/mail.example.com.key
  syslog_facility = local0
  userdb {
    args = username_format=%u /etc/dovecot/users
    driver = passwd-file
  }
  valid_chroot_dirs = /var/mail
  verbose_proctitle = yes
  verbose_ssl = yes
  protocol lda {
    postmaster_address = postmaster at example.com
  }