[Dovecot] rc31 -> "deferring operation: binding"

Ben Beuchler insyte at gmail.com
Wed Apr 11 03:02:35 EEST 2007

On 4/10/07, Timo Sirainen <tss at iki.fi> wrote:
> On 10.4.2007, at 4.04, Ben Beuchler wrote:
> > As I understand it, the new auth_bind code is extremely careful about
> > flushing all pending operations before attempting to perform the
> > authentication bind.  If that's the case, any idea why OpenLDAP is
> > deferring the binding operations so frequently?  So far it hasn't
> > caused any login problems, but it's quite disconcerting given the
> > expected behavior described in the Changelog.
> Well, I've really no idea. I know it works for many people and I
> couldn't get it to break when stress testing with hundreds of
> connections per second.

I installed a virgin install of OpenLDAP 2.3.32 directly on the mail
server, copied over my LDAP database, pointed Dovecot at it, and
started it up.  I immediately started getting the same log entries:

Apr 10 18:55:45 cliff slapd[10420]: connection_input: conn=3 deferring
operation: binding

I *must* be doing something wrong...  Or, at least, I must be doing
something a little different than the other test cases.  Any thoughts?

The really frustrating thing, of course, is that I really have no
proof whatsoever that the occasional auth failures (all authentication
attempts hang until Dovecot is restarted) have anything to do with the

cliff:/usr/local/etc/openldap root# /opt/dovecot/sbin/dovecot -n
# /opt/dovecot-1.0.rc31/etc/dovecot.conf
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imap imaps pop3 pop3s
ssl_cert_file: /etc/ssl/certs/mcad.edu.rapidssl.crt
ssl_key_file: /etc/ssl/private/mcad.edu.rapidssl.key
disable_plaintext_auth: no
verbose_ssl: yes
shutdown_clients: no
login_dir: /opt/dovecot-1.0.rc31/var/run/dovecot/login
login_executable(default): /opt/dovecot-1.0.rc31/libexec/dovecot/imap-login
login_executable(imap): /opt/dovecot-1.0.rc31/libexec/dovecot/imap-login
login_executable(pop3): /opt/dovecot-1.0.rc31/libexec/dovecot/pop3-login
login_greeting: Line forms at the rear.
login_greeting_capability(default): yes
login_greeting_capability(imap): yes
login_greeting_capability(pop3): no
login_processes_count: 5
verbose_proctitle: yes
first_valid_uid: 5000
last_valid_uid: 5000
first_valid_gid: 5000
last_valid_gid: 5000
mail_location: maildir:/mail/mcad.edu/%u/Maildir/
maildir_stat_dirs: yes
maildir_copy_with_hardlinks: yes
mail_executable(default): /opt/dovecot-1.0.rc31/libexec/dovecot/imap
mail_executable(imap): /opt/dovecot-1.0.rc31/libexec/dovecot/imap
mail_executable(pop3): /opt/dovecot-1.0.rc31/libexec/dovecot/pop3
mail_plugin_dir(default): /opt/dovecot-1.0.rc31/lib/dovecot/imap
mail_plugin_dir(imap): /opt/dovecot-1.0.rc31/lib/dovecot/imap
mail_plugin_dir(pop3): /opt/dovecot-1.0.rc31/lib/dovecot/pop3
pop3_uidl_format(pop3): %08Xu%08Xv
auth default:
  mechanisms: plain login
  user: dovecot-auth
  verbose: yes
  debug: yes
    driver: ldap
    args: /opt/dovecot/etc/dovecot-ldap.conf
    driver: static
    args: uid=5000 gid=5000
    type: listen
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix

cliff:~ root# egrep -v '(^$|^#)' /opt/dovecot/etc/dovecot-ldap.conf
uris = ldap://localhost
auth_bind = yes
ldap_version = 3
base = dc=accounts,dc=ldap,dc=mcad,dc=edu
pass_attrs = uid=user,userPassword=password
pass_filter = (&(objectClass=mcadEmailAccount)(activePopImap=TRUE)(uid=%u))
default_pass_scheme = SSHA
user_global_uid = 5000
user_global_gid = 5000

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