[Dovecot] Problems with Outlook clients after a migration

[Joseba Torre]

Hi,

I'm doing the final tests before I migrate my 10000 users from RHEL 4 + 
dovecot 1.1.20 to RHEL5 + dovecot 1.2.11, and I'm having some serious problems 
with outlook 2007 clients disconnecting very often.

In dovecot's log I see  lot of connects and disconnects from these clients (as 
oposed to my kmail, that just connects once when I come in and disconnects 
when I shut it off). After unchecking the "chek every X minutes" thing in 
outlook  I get fewer of those -while functionality remains-, but the main 
problem still persists: every now and then (more or less 30 mins), the client 
disconnects, and sometimes the client goes offline. This didn't happen with my 
previous setup.

I use the outlook-idle workaround, but it doesn't seem to make any difference.  
Any ideas?

My dovecot -n

# 1.2.11: /usr/local/etc/dovecot.conf
# OS: Linux 2.6.18-164.11.1.el5 x86_64 Red Hat Enterprise Linux Server release 
5.4 (Tikanga) 
syslog_facility: local1
protocols: imap imaps pop3 pop3s
listen(default): *:143
listen(imap): *:143
listen(pop3): *:110
ssl_listen(default): *:993
ssl_listen(imap): *:993
ssl_listen(pop3): *:995
ssl_cert_file: /usr/share/ssl/certs/imapd.pem
ssl_key_file: /usr/share/ssl/certs/imapd.pem
disable_plaintext_auth: no
login_dir: /usr/local/var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login
login_executable(imap): /usr/local/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
login_process_per_connection: no
login_max_processes_count: 256
max_mail_processes: 2048
first_valid_uid: 100
mail_location: maildir:~/Maildir:INDEX=/var/dovecot/%u:CONTROL=/var/dovecot-
nas/%u/control
mail_nfs_storage: yes
lock_method: dotlock
mail_executable(default): /usr/local/libexec/dovecot/imap
mail_executable(imap): /usr/local/libexec/dovecot/imap
mail_executable(pop3): /usr/local/libexec/dovecot/pop3
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugin_dir(default): /usr/local/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
imap_client_workarounds(default): outlook-idle
imap_client_workarounds(imap): outlook-idle
imap_client_workarounds(pop3): 
pop3_uidl_format(default): %08Xu%08Xv
pop3_uidl_format(imap): %08Xu%08Xv
pop3_uidl_format(pop3): %v.%u
auth default:
  cache_size: 1000
  cache_ttl: 6000
  master_user_separator: *
  debug: yes
  passdb:
    driver: passwd-file
    args: /usr/local/etc/bloqueados
    deny: yes
  passdb:
    driver: ldap
    args: /usr/local/etc/dovecot-ldap.conf
  passdb:
    driver: pam
  passdb:
    driver: passwd-file
    args: /usr/local/etc/dovecot-master.conf
    master: yes
  userdb:
    driver: prefetch
  userdb:
    driver: passwd
  socket:
    type: listen
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
plugin:
  quota: fs

-- 
Joseba Torre. Vicegerencia de TICs, área de Explotación