Matt Roman
2006-Jul-12 19:33 UTC
[Dovecot] Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable
So I just upgraded from Dovecot 0.99 to the latest 1.0 RC2 because I was having all sorts of Authentication problems and crashes in 0.99. The upgrade did not solve the problem apparently. Dovecot still crashes periodically and always needs to be manually rebooted. The log file errors at the time of the crash: dovecot: Jul 12 14:30:59 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:04 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:09 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:14 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:19 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:24 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:29 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:30 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:33 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:35 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:39 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:40 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:44 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:45 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:49 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:50 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:54 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:55 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:59 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:59 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:31:59 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:00 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:04 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:04 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:04 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:05 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:09 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:09 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable dovecot: Jul 12 14:32:09 Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable I use PAM on the dovecot server connecting to a separate OpenLDAP server with the maildirs on NFS. Currently only the dovecot server talks to the maildirs. Postfix is also on this server, using the same PAM Authentication for SASL and works fine - It does not appear to be a problem with the Authentication server. Thanks in advance!!! -Matt
Matt Roman
2006-Jul-12 19:41 UTC
[Dovecot] Error: imap-login: Can't connect to auth server atdefault: Resource temporarily unavailable
Here is my /etc/dovecot.conf:
Thanks Again!!!
## Dovecot configuration file
# If you're in a hurry, see http://wiki.dovecot.org/QuickConfiguration
# '#' character and everything after it is treated as comments. Extra
spaces
# and tabs are ignored. If you want to use either of these explicitly, put
the # value inside quotes, eg.: key = "# char and trailing whitespace
"
# Default values are shown after each value, it's not required to uncomment
# any of the lines.
# Base directory where to store runtime data.
#base_dir = /var/run/dovecot/
# Protocols we want to be serving: imap imaps pop3 pop3s #protocols = imap
imaps pop3 pop3s
# IP or host address where to listen in for connections. It's not currently
# possible to specify multiple addresses. "*" listens in all IPv4
interfaces.
# "[::]" listens in all IPv6 interfaces, but may also listen in all
IPv4 #
interfaces depending on the operating system.
#
# If you want to specify ports for each service, you will need to configure
# these settings inside the protocol imap/pop3 { ... } section, so you can #
specify different ports for IMAP/POP3. For example:
# protocol imap {
# listen = *:10143
# ssl_listen = *:10943
# ..
# }
# protocol pop3 {
# listen = *:10100
# ..
# }
#listen = [::]
# Disable LOGIN command and all other plaintext authentications unless #
SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP #
matches the local IP (ie. you're connecting from the same computer), the #
connection is considered secure and plaintext authentication is allowed.
#disable_plaintext_auth = no
# Should all IMAP and POP3 processes be killed when Dovecot master process #
shuts down. Setting this to "no" means that Dovecot can be upgraded
without
# forcing existing client connections to close (although that could also be
# a problem if the upgrade is eg. because of a security fix). This however #
means that after master process has died, the client processes can't write #
to log files anymore.
#shutdown_clients = yes
##
## Logging
##
# Use this logfile instead of syslog(). /dev/stderr can be used if you want
to # use stderr for logging (ONLY /dev/stderr - otherwise it is closed).
#log_path log_path = /var/log/dovecot10
# For informational messages, use this logfile instead of the default
#info_log_path = info_log_path = /var/log/dovecot10-info
# Prefix for each line written to log file. % codes are in strftime(3) #
format.
#log_timestamp = "%b %d %H:%M:%S "
# Syslog facility to use if you're logging to syslog. Usually if you
don't #
want to use "mail", you'll use local0..local7. Also other standard
#
facilities are supported.
#syslog_facility = mail
##
## SSL settings
##
# IP or host address where to listen in for SSL connections. Defaults # to
above if not specified.
#ssl_listen
# Disable SSL/TLS support.
#ssl_disable = no
# PEM encoded X.509 SSL/TLS certificate and private key. They're opened
before # dropping root privileges, so keep the key file unreadable by anyone
but # root. Included doc/mkcert.sh can be used to easily generate
self-signed # certificate, just make sure to update the domains in
dovecot-openssl.cnf #ssl_cert_file = /etc/pki/dovecot/certs/dovecot.pem
#ssl_key_file = /etc/pki/dovecot/private/dovecot.pem
ssl_cert_file = /etc/postfix/newcert.pem ssl_key_file = /etc/postfix/newreq.
pem
# If key file is password protected, give the password here. Alternatively #
give it when starting dovecot with -p parameter.
#ssl_key_password
# File containing trusted SSL certificate authorities. Usually not needed.
#ssl_ca_file =
# Request client to send a certificate.
#ssl_verify_client_cert = no
# How often to regenerate the SSL parameters file. Generation is quite CPU #
intensive operation. The value is in hours, 0 disables regeneration #
entirely.
#ssl_parameters_regenerate = 168
# SSL ciphers to use
#ssl_cipher_list = ALL:!LOW
# Show protocol level SSL errors.
#verbose_ssl = no
##
## Login processes
##
# Directory where authentication process places authentication UNIX sockets
# which login needs to be able to connect to. The sockets are created when #
running as root, so you don't have to worry about permissions. Note that #
everything in this directory is deleted when Dovecot is started.
#login_dir = /var/run/dovecot/login
# chroot login process to the login_dir. Only reason not to do this is if
you # wish to run the whole Dovecot without roots.
# http://wiki.dovecot.org/Rootless
#login_chroot = yes
# User to use for the login process. Create a completely new user for this,
# and don't use it anywhere else. The user must also belong to a group where
# only it has access, it's used to control access for authentication
process.
# Note that this user is NOT used to access mails.
# http://wiki.dovecot.org/UserIds
#login_user = dovecot
# Set max. process size in megabytes. If you don't use #
login_process_per_connection you might need to grow this.
login_process_size = 32
# Should each login be processed in it's own process (yes), or should one #
login process be allowed to process multiple connections (no)? Yes is more #
secure, espcially with SSL/TLS enabled. No is faster since there's no need #
to create processes all the time.
login_process_per_connection = yes
# Number of login processes to create. If login_process_per_connection is #
yes, this is the number of extra processes waiting for users to log in.
login_processes_count = 3
# Maximum number of extra login processes to create. The extra process count
# usually stays at login_processes_count, but when multiple users start
logging # in at the same time more extra processes are created. To prevent
fork-bombing # we check only once in a second if new processes should be
created - if all # of them are used at the time, we double their amount
until limit set by this # setting is reached. This setting is used only if #
login_process_per_connection is yes.
login_max_processes_count = 128
# Maximum number of connections allowed in login state. When this limit is #
reached, the oldest connections are dropped. If login_process_per_connection
# is no, this is a per-process value, so the absolute maximum number of
users # logging in actually login_processes_count * max_logging_users.
login_max_logging_users = 256
# Greeting message for clients.
login_greeting = LXDNET IMAP READY
# Space-separated list of elements we want to log. The elements which have #
a non-empty variable value are joined together to form a comma-separated #
string.
#login_log_format_elements = user=<%u> method=%m rip=%r lip=%l %c
# Login log format. %$ contains login_log_format_elements string, %s
contains # the data we want to log.
#login_log_format = %$: %s
##
## Mailbox locations and namespaces
##
# Default MAIL environment to use when it's not set. By leaving this empty #
dovecot tries to do some automatic detection as described in #
doc/mail-storages.txt. There are a few special variables you can use, eg.:
#
# %u - username
# %n - user part in user at domain, same as %u if there's no domain
# %d - domain part in user at domain, empty if there's no domain
# %h - home directory
#
# See doc/variables.txt for full list. Some examples:
#
# default_mail_env = maildir:/var/mail/%1u/%u/Maildir
# default_mail_env = mbox:~/mail/:INBOX=/var/mail/%u
# default_mail_env = mbox:/var/mail/%d/%n/:INDEX=/var/indexes/%d/%n
#
#default_mail_env =
# If you need to set multiple mailbox locations or want to change default #
namespace settings, you can do it by defining namespace sections:
#
# You can have private, shared and public namespaces. The only difference #
between them is how Dovecot announces them to client via NAMESPACE #
extension. Shared namespaces are meant for user-owned mailboxes which are #
shared to other users, while public namespaces are for more globally #
accessible mailboxes.
#
# REMEMBER: If you add any namespaces, the default namespace must be added #
explicitly, ie. default_mail_env does nothing unless you have a namespace #
without a location setting. Default namespace is simply done by having a #
namespace with empty prefix.
#namespace private {
# Hierarchy separator to use. You should use the same separator for all
# namespaces or some clients get confused. '/' is usually a good one.
#separator = /
# Prefix required to access this namespace. This needs to be different
for
# all namespaces. For example "Public/".
#prefix =
# Physical location of the mailbox. This is in same format as
# default_mail_env, which is also the default for it.
#location
# There can be only one INBOX, and this setting defines which namespace
# has it.
#inbox = yes
# If namespace is hidden, it's not advertised to clients via NAMESPACE
# extension or shown in LIST replies. This is mostly useful when
converting
# from another server with different namespaces which you want to
depricate
# but still keep working. For example you can create hidden namespaces
with
# prefixes "~/mail/", "~%u/mail/" and "mail/".
#hidden = yes
#}
# Grant access to these extra groups for mail processes. Typical use would
be # to give "mail" group write access to /var/mail to be able to
create
dotlocks.
#mail_extra_groups
# Allow full filesystem access to clients. There's no access checks other
than # what the operating system does for the active UID/GID. It works with
both # maildir and mboxes, allowing you to prefix mailboxes names with eg.
/path/ # or ~user/.
#mail_full_filesystem_access = no
##
## Mail processes
##
# Enable mail process debugging. This can help you figure out why Dovecot #
isn't finding your mails.
#mail_debug = no
mail_debug = yes
# Log prefix for mail processes. See doc/variables.txt for list of possible
# variables you can use.
#mail_log_prefix = "%Us(%u): "
# Use mmap() instead of read() to read mail files. read() seems to be a bit
# faster with my Linux/x86 and it's better with NFS, so that's the
default.
# Note that OpenBSD 3.3 and older don't work right with mail_read_mmaped
yes.
#mail_read_mmaped = no
# Don't use mmap() at all. This is required if you store indexes to shared #
filesystems (NFS or clustered filesystem).
#mmap_disable = no
mmap_disable = yes
# Don't write() to mmaped files. This is required for some operating systems
# which use separate caches for them, such as OpenBSD.
#mmap_no_write = no
# Locking method for index files. Alternatives are fcntl, flock and dotlock.
# Dotlocking uses some tricks which may create more disk I/O than other
locking # methods. NOTE: If you use NFS, remember to change also
mmap_disable setting!
#lock_method = fcntl
#lock_method = dotlock
# Drop all privileges before exec()ing the mail process. This is mostly #
meant for debugging, otherwise you don't get core dumps. It could be a small
# security risk if you use single UID for multiple users, as the users could
# ptrace() each others processes then.
#mail_drop_priv_before_exec = no
# Show more verbose process titles (in ps). Currently shows user name and #
IP address. Useful for seeing who are actually using the IMAP processes #
(eg. shared mailboxes or if same uid is used for multiple accounts).
#verbose_proctitle = no
# Valid UID range for users, defaults to 500 and above. This is mostly # to
make sure that users can't log in as daemons or other system users.
# Note that denying root logins is hardcoded to dovecot binary and can't #
be done even if first_valid_uid is set to 0.
#first_valid_uid = 500
#last_valid_uid = 0
# Valid GID range for users, defaults to non-root/wheel. Users having #
non-valid GID as primary group ID aren't allowed to log in. If user #
belongs to supplementary groups with non-valid GIDs, those groups are # not
set.
#first_valid_gid = 1
#last_valid_gid = 0
# Maximum number of running mail processes. When this limit is reached, #
new users aren't allowed to log in.
#max_mail_processes = 1024
# Set max. process size in megabytes. Most of the memory goes to mmap()ing #
files, so it shouldn't harm much even if this limit is set pretty high.
#mail_process_size = 256
# Maximum allowed length for mail keyword name. It's only forced when trying
# to create new keywords.
#mail_max_keyword_length = 50
# Default umask to use for mail files and directories.
#umask = 0077
# ':' separated list of directories under which chrooting is allowed for
mail # processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar
too).
# This setting doesn't affect login_chroot or auth_chroot variables.
# WARNING: Never add directories here which local users can modify, that #
may lead to root exploit. Usually this should be done only if you don't #
allow shell access for users. See doc/configuration.txt for more
information.
#valid_chroot_dirs =
# Default chroot directory for mail processes. This can be overridden for #
specific users in user database by giving /./ in user's home directory #
(eg. /home/./user chroots into /home). Note that usually there is no real #
need to do chrooting, Dovecot doesn't allow users to access files outside #
their mail directory anyway.
#mail_chroot =
##
## Mailbox handling optimizations
##
# Space-separated list of fields to initially save into cache file.
Currently # these fields are allowed:
#
# flags, date.sent, date.received, size.virtual, size.physical #
mime.parts, imap.body, imap.bodystructure # # Different IMAP clients work in
different ways, so they benefit from # different cached fields. Some do not
benefit from them at all. Caching more # than necessary generates useless
disk I/O, so you don't want to do that # either.
#
# Dovecot attempts to automatically figure out what client wants and it
keeps # only that. However the first few times a mailbox is opened, Dovecot
hasn't # yet figured out what client needs, so it may not perform optimally.
If you # know what fields the majority of your clients need, it may be
useful to set # these fields by hand. If client doesn't actually use them,
Dovecot will # eventually drop them.
#
# Usually you should just leave this field alone. The potential benefits are
# typically unnoticeable.
#mail_cache_fields =
# Space-separated list of fields that Dovecot should never save to cache
file.
# Useful if you want to save disk space at the cost of more I/O when the
fields # needed.
#mail_never_cache_fields =
# The minimum number of mails in a mailbox before updates are done to cache
# file. This allows optimizing Dovecot's behavior to do less disk writes at
# the cost of more disk reads.
#mail_cache_min_mail_count = 0
# When IDLE command is running, mailbox is checked once in a while to see if
# there are any new mails or other changes. This setting defines the minimum
# time to wait between those checks. Dovecot is however able to use dnotify
# and inotify with Linux to reply immediately after the change occurs.
#mailbox_idle_check_interval = 30
# Save mails with CR+LF instead of plain LF. This makes sending those mails
# take less CPU, especially with sendfile() syscall with Linux and FreeBSD.
# But it also creates a bit more disk I/O which may just make it slower.
# Also note that if other software reads the mboxes/maildirs, they may
handle # the extra CRs wrong and cause problems.
#mail_save_crlf = no
##
## Maildir-specific settings
##
# By default LIST command returns all entries in maildir beginning with dot.
# Enabling this option makes Dovecot return only entries which are
directories.
# This is done by stat()ing each entry, so it causes more disk I/O.
# (For systems setting struct dirent->d_type, this check is free and it's
#
done always regardless of this setting) #maildir_stat_dirs = no
# Copy mail to another folders using hard links. This is much faster than #
actually copying the file. This is problematic only if something modifies #
the mail in one folder but doesn't want it modified in the others. I
don't #
know any MUA which would modify mail files directly. IMAP protocol also #
requires that the mails don't change, so it would be problematic in any
case.
# If you care about performance, enable it.
#maildir_copy_with_hardlinks = no
##
## mbox-specific settings
##
# Which locking methods to use for locking mbox. There are four available:
# dotlock: Create <mailbox>.lock file. This is the oldest and most
NFS-safe
# solution. If you want to use /var/mail/ like directory, the
users
# will need write access to that directory.
# fcntl : Use this if possible. Works with NFS too if lockd is used.
# flock : May not exist in all systems. Doesn't work with NFS.
# lockf : May not exist in all systems. Doesn't work with NFS.
#
# You can use multiple locking methods; if you do the order they're declared
# in is important to avoid deadlocks if other MTAs/MUAs are using multiple #
locking methods as well. Some operating systems don't allow using some of #
them simultaneously.
#mbox_read_locks = fcntl
#mbox_write_locks = fcntl
# Maximum time in seconds to wait for lock (all of them) before aborting.
#mbox_lock_timeout = 300
# If dotlock exists but the mailbox isn't modified in any way, override the
# lock file after this many seconds.
#mbox_dotlock_change_timeout = 120
# When mbox changes unexpectedly we have to fully read it to find out what #
changed. If the mbox is large this can take a long time. Since the change #
is usually just a newly appended mail, it'd be faster to simply read the #
new mails. If this setting is enabled, Dovecot does this but still safely #
fallbacks to re-reading the whole mbox file whenever something in mbox isn't
# how it's expected to be. The only real downside to this setting is that if
# some other MUA changes message flags, Dovecot doesn't notice it
immediately.
# Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK #
commands.
#mbox_dirty_syncs = yes
# Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE,
# EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored.
#mbox_very_dirty_syncs = no
# Delay writing mbox headers until doing a full write sync (EXPUNGE and
CHECK # commands and when closing the mailbox). This is especially useful
for POP3 # where clients often delete all mails. The downside is that our
changes # aren't immediately visible to other MUAs.
#mbox_lazy_writes = yes
# If mbox size is smaller than this (in kilobytes), don't write index files.
# If an index file already exists it's still read, just not updated.
#mbox_min_index_size = 0
##
## dbox-specific settings
##
# Maximum dbox file size in kilobytes until it's rotated.
#dbox_rotate_size = 2048
# Minimum dbox file size in kilobytes before it's rotated # (overrides
dbox_rotate_days) #dbox_rotate_min_size = 16
# Maximum dbox file age in days until it's rotated. Day always begins from #
midnight, so 1 = today, 2 = yesterday, etc. 0 = check disabled.
#dbox_rotate_days = 0
##
## IMAP specific settings
##
protocol imap {
# Login executable location.
#login_executable = /usr/libexec/dovecot/imap-login
# IMAP executable location. Changing this allows you to execute other
# binaries before the imap process is executed.
#
# This would write rawlogs into ~/dovecot.rawlog/ directory:
# mail_executable = /usr/libexec/dovecot/rawlog
/usr/libexec/dovecot/imap
#
# This would attach gdb into the imap process and write backtraces into
# /tmp/gdbhelper.* files:
# mail_executable = /usr/libexec/dovecot/gdbhelper
/usr/libexec/dovecot/imap
#
#mail_executable = /usr/libexec/dovecot/imap
# Maximum IMAP command line length in bytes. Some clients generate very
long
# command lines with huge mailboxes, so you may need to raise this if you
get
# "Too long argument" or "IMAP command line too large"
errors often.
#imap_max_line_length = 65536
# Support for dynamically loadable plugins. mail_plugins is a space
separated
# list of plugins to load.
#mail_plugins #mail_plugin_dir = /usr/lib/dovecot/imap
# Send IMAP capabilities in greeting message. This makes it unnecessary
for
# clients to request it with CAPABILITY command, so it saves one
round-trip.
# Many clients however don't understand it and ask the CAPABILITY anyway.
#login_greeting_capability = no
# Workarounds for various client bugs:
# delay-newmail:
# Send EXISTS/RECENT new mail notifications only when replying to NOOP
# and CHECK commands. Some clients ignore them otherwise, for example
# OSX Mail. Outlook Express breaks more badly though, without this it
# may show user "Message no longer in server" errors. Note that
OE6
still
# breaks even with this workaround if synchronization is set to
# "Headers Only".
# outlook-idle:
# Outlook and Outlook Express never abort IDLE command, so if no mail
# arrives in half a hour, Dovecot closes the connection. This is still
# fine, except Outlook doesn't connect back so you don't see if
new
mail
# arrives.
# netscape-eoh:
# Netscape 4.x breaks if message headers don't end with the empty
"end
of
# headers" line. Normally all messages have this, but setting this
# workaround makes sure that Netscape never breaks by adding the line
if
# it doesn't exist. This is done only for FETCH BODY[HEADER.FIELDS..]
# commands. Note that RFC says this shouldn't be done.
# tb-extra-mailbox-sep:
# With mbox storage a mailbox can contain either mails or
submailboxes,
# but not both. Thunderbird separates these two by forcing server to
# accept '/' suffix in mailbox names in subscriptions list.
# The list is space-separated.
imap_client_workarounds = outlook-idle delay-newmail }
##
## POP3 specific settings
##
protocol pop3 {
# Login executable location.
#login_executable = /usr/libexec/dovecot/pop3-login
# POP3 executable location
#mail_executable = /usr/libexec/dovecot/pop3
# Don't try to set mails non-recent or seen with POP3 sessions. This is
# mostly intended to reduce disk I/O. With maildir it doesn't move files
# from new/ to cur/, with mbox it doesn't write Status-header.
#pop3_no_flag_updates = no
# Support LAST command which exists in old POP3 specs, but has been
removed
# from new ones. Some clients still wish to use this though. Enabling this
# makes RSET command clear all \Seen flags from messages.
#pop3_enable_last = no
# If mail has X-UIDL header, use it as the mail's UIDL.
#pop3_reuse_xuidl = no
# Keep the mailbox locked for the entire POP3 session.
#pop3_lock_session = no
# POP3 UIDL format to use. You can use following variables:
#
# %v - Mailbox UIDVALIDITY
# %u - Mail UID
# %m - MD5 sum of the mailbox headers in hex (mbox only)
# %f - filename (maildir only)
#
# If you want UIDL compatibility with other POP3 servers, use:
# UW's ipop3d : %08Xv%08Xu
# Courier version 0 : %f
# Courier version 1 : %u
# Courier version 2 : %v-%u
# Cyrus (<= 2.1.3) : %u
# Cyrus (>= 2.1.4) : %v.%u
# Older Dovecots : %v.%u
# tpop3d : %Mf
#
# Note that Outlook 2003 seems to have problems with %v.%u format which
was
# Dovecot's default, so if you're building a new server it would be a
good
# idea to change this. %08Xu%08Xv should be pretty fail-safe.
#
# NOTE: Nowadays this is required to be set explicitly, since the old
# default was bad but it couldn't be changed without breaking existing
# installations. %08Xu%08Xv will be the new default, so use it for new
# installations.
#
#pop3_uidl_format = %08Xu%08Xv
# POP3 logout format string:
# %t - number of TOP commands
# %p - number of bytes sent to client as a result of TOP command
# %r - number of RETR commands
# %b - number of bytes sent to client as a result of RETR command
# %d - number of deleted messages
# %m - number of messages (before deletion)
# %s - mailbox size in bytes (before deletion)
#pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s
# Support for dynamically loadable plugins. mail_plugins is a space
separated
# list of plugins to load.
#mail_plugins #mail_plugin_dir = /usr/lib/dovecot/pop3
# Workarounds for various client bugs:
# outlook-no-nuls:
# Outlook and Outlook Express hang if mails contain NUL characters.
# This setting replaces them with 0x80 character.
# oe-ns-eoh:
# Outlook Express and Netscape Mail breaks if end of headers-line is
# missing. This option simply sends it if it's missing.
# The list is space-separated.
#pop3_client_workarounds }
##
## LDA specific settings
##
protocol lda {
# Address to use when sending rejection mails.
postmaster_address = postmaster at example.com
# Hostname to use in various parts of sent mails, eg. in Message-Id.
# Default is the system's real hostname.
#hostname =
# Support for dynamically loadable plugins. mail_plugins is a space
separated
# list of plugins to load.
#mail_plugins #mail_plugin_dir = /usr/lib/dovecot/lda
# Binary to use for sending mails.
#sendmail_path = /usr/lib/sendmail
# UNIX socket path to master authentication server to find users.
#auth_socket_path = /var/run/dovecot/auth-master }
##
## Authentication processes
##
# Executable location
#auth_executable = /usr/libexec/dovecot/dovecot-auth
# Set max. process size in megabytes.
#auth_process_size = 256
# Authentication cache size in kilobytes. 0 means it's disabled.
# Note that bsdauth, PAM and vpopmail require cache_key to be set for
caching # to be used. Also note that currently auth cache doesn't work very
well if # you're using multiple passdbs with same usernames in them.
#auth_cache_size = 0
# Time to live in seconds for cached data. After this many seconds the
cached # record is no longer used, *except* if the main database lookup
returns # internal failure.
#auth_cache_ttl = 3600
# Space separated list of realms for SASL authentication mechanisms that
need # them. You can leave it empty if you don't want to support multiple
realms.
# Many clients simply use the first one listed here, so keep the default
realm # first.
#auth_realms
# Default realm/domain to use if none was specified. This is used for both #
SASL realms and appending @domain to username in plaintext logins.
#auth_default_realm =
# List of allowed characters in username. If the user-given username
contains # a character not listed in here, the login automatically fails.
This is just # an extra check to make sure user can't exploit any potential
quote escaping # vulnerabilities with SQL/LDAP databases. If you want to
allow all characters, # set this value to empty.
#auth_username_chars
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@
# Username character translations before it's looked up from databases. The
# value contains series of from -> to characters. For example
"#@/@" means #
that '#' and '/' characters are translated to '@'.
#auth_username_translation
# Username formatting before it's looked up from databases. You can use #
the standard variables here, eg. %Lu would lowercase the username, %n would
# drop away the domain if it was given, or "%n-AT-%d" would change the
'@'
into # "-AT-". This translation is done after
auth_username_translation
changes.
#auth_username_format
# If you want to allow master users to log in by specifying the master #
username within the normal username string (ie. not using SASL mechanism's #
support for it), you can specify the separator character here. The format #
is then <username><separator><master username>. UW-IMAP uses
"*" as the #
separator, so that could be a good choice.
#auth_master_user_separator
# Username to use for users logging in with ANONYMOUS SASL mechanism
#auth_anonymous_username = anonymous
# More verbose logging. Useful for figuring out why authentication isn't #
working.
#auth_verbose = no
# Even more verbose logging for debugging purposes. Shows for example SQL #
queries.
#auth_debug = no
# In case of password mismatches, log the passwords and used scheme so the #
problem can be debugged. Requires auth_debug=yes to be set.
#auth_debug_passwords = no
# Maximum number of dovecot-auth worker processes. They're used to execute #
blocking passdb and userdb queries (eg. MySQL and PAM). They're #
automatically created and destroyed as needed.
#auth_worker_max_count = 30
# Kerberos keytab to use for the GSSAPI mechanism. Will use the system #
default (usually /etc/krb5.keytab) if not specified.
#auth_krb5_keytab =
auth default {
# Space separated list of wanted authentication mechanisms:
# plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi
mechanisms = plain
#
# Password database is used to verify user's password (and nothing more).
# You can have multiple passdbs and userdbs. This is useful if you want to
# allow both system users (/etc/passwd) and virtual users to login without
# duplicating the system users into virtual database.
#
# http://wiki.dovecot.org/Authentication
#
# By adding master=yes setting inside a passdb you make the passdb a list
# of "master users", who can log in as anyone else. Unless
you're using
PAM,
# you probably still want the destination user to be looked up from passdb
# that it really exists. This can be done by adding pass=yes setting to
the
# master passdb.
#
# http://wiki.dovecot.org/MasterPassword
# Users can be temporarily disabled by adding a passdb with deny=yes.
# If the user is found from that database, authentication will fail.
# The deny passdb should always be specified before others, so it gets
# checked first. Here's an example:
#passdb passwd-file {
# File contains a list of usernames, one per line
#args = /etc/dovecot.deny
#deny = yes
#}
# PAM authentication. Preferred nowadays by most systems.
# Note that PAM can only be used to verify if user's password is correct,
# so it can't be used as userdb. If you don't want to use a separate
user
# database (passwd usually), you can use static userdb.
# REMEMBER: You'll need /etc/pam.d/dovecot file created for PAM
# authentication to actually work.
passdb pam {
# [session=yes] [setcred=yes] [cache_key=<key>] [<service
name>]
#
# session=yes makes Dovecot open and immediately close PAM session. Some
# PAM plugins need this to work, such as pam_mkhomedir.
#
# setcred=yes makes Dovecot establish PAM credentials if some PAM
plugins
# need that. They aren't ever deleted though, so this isn't enabled
by
# default.
#
# cache_key can be used to enable authentication caching for PAM
# (auth_cache_size also needs to be set). It isn't enabled by default
# because PAM modules can do all kinds of checks besides checking
password,
# such as checking IP address. Dovecot can't know about these checks
# without some help. cache_key is simply a list of variables (see
# doc/variables.txt) which must match for the cached data to be used.
# Here are some examples:
# %u - Username must match. Probably sufficient for most uses.
# %u%r - Username and remote IP address must match.
# %u%s - Username and service (ie. IMAP, POP3) must match.
#
# If service name is "*", it means the authenticating service name
# is used, eg. pop3 or imap (/etc/pam.d/pop3, /etc/pam.d/imap).
#
# Some examples:
# args = session=yes *
# args = cache_key=%u dovecot
#args = dovecot
}
# /etc/passwd or similar, using getpwnam()
# In many systems nowadays this uses Name Service Switch, which is
# configured in /etc/nsswitch.conf.
#passdb passwd {
#}
# /etc/shadow or similiar, using getspnam(). Deprecated by PAM nowadays.
#passdb shadow {
#}
# BSD authentication. Used by at least OpenBSD.
#passdb bsdauth {
# [cache_key=<key>] - See cache_key in PAM for explanation.
#args #}
# passwd-like file with specified location
#passdb passwd-file {
# Path for passwd-file
#args #}
# checkpassword executable authentication
# NOTE: You will probably want to use "userdb prefetch" with this.
#passdb checkpassword {
# Path for checkpassword binary
#args #}
# SQL database
#passdb sql {
# Path for SQL configuration file, see doc/dovecot-sql.conf for example
#args #}
# LDAP database
#passdb ldap {
# Path for LDAP configuration file, see doc/dovecot-ldap.conf for
example
#args #}
# vpopmail authentication
#passdb vpopmail {
# [cache_key=<key>] - See cache_key in PAM for explanation.
#args #}
#
# User database specifies where mails are located and what user/group IDs
# own them. For single-UID configuration use "static".
#
# http://wiki.dovecot.org/Authentication
# http://wiki.dovecot.org/VirtualUsers
#
# /etc/passwd or similar, using getpwnam()
# In many systems nowadays this uses Name Service Switch, which is
# configured in /etc/nsswitch.conf.
userdb passwd {
}
# passwd-like file with specified location
#userdb passwd-file {
# Path for passwd-file
#args #}
# static settings generated from template
#userdb static {
# Template for settings. Can return anything a userdb could normally
# return, eg.: uid, gid, home, mail, nice
#
# A few examples:
#
# args = uid=500 gid=500 home=/var/mail/%u
# args = uid=500 gid=500 home=/home/%u mail=mbox:/home/%u/mail nice=10
#
#args #}
# SQL database
#userdb sql {
# Path for SQL configuration file, see doc/dovecot-sql.conf for example
#args #}
# LDAP database
#userdb ldap {
# Path for LDAP configuration file, see doc/dovecot-ldap.conf for
example
#args #}
# vpopmail
#userdb vpopmail {
#}
# "prefetch" user database means that the passdb already provided
the
# needed information and there's no need to do a separate userdb lookup.
# This can be made to work with SQL and LDAP databases, see their example
# configuration files for more information how to do it.
# http://wiki.dovecot.org/AuthSpecials
#userdb prefetch {
#}
# User to use for the process. This user needs access to only user and
# password databases, nothing else. Only shadow and pam authentication
# requires roots, so use something else if possible. Note that passwd
# authentication with BSDs internally accesses shadow files, which also
# requires roots. Note that this user is NOT used to access mails.
# That user is specified by userdb above.
user = root
# Directory where to chroot the process. Most authentication backends
don't
# work if this is set, and there's no point chrooting if auth_user is
root.
# Note that valid_chroot_dirs isn't needed to use this setting.
#chroot =
# Number of authentication processes to create
#count = 1
# Require a valid SSL client certificate or the authentication fails.
#ssl_require_client_cert = no
# Take the username from client's SSL certificate, using
X509_NAME_oneline()
# which typically uses subject's Distinguished Name.
#ssl_username_from_cert = no
# It's possible to export the authentication interface to other programs:
#socket listen {
#master {
# Master socket is typically used to give Dovecot's local delivery
# agent access to userdb so it can find mailbox locations. It can
# however also be used to disturb regular user authentications.
# WARNING: Giving untrusted users access to master socket may be a
# security risk, don't give too wide permissions to it!
#path = /var/run/dovecot/auth-master
#mode = 0600
# Default user/group is the one who started dovecot-auth (root)
#user =
#group =
#}
#client {
# The client socket is generally safe to export to everyone. Typical
use
# is to export it to your SMTP server so it can do SMTP AUTH lookups
# using it.
#path = /var/run/dovecot/auth-client
#mode = 0660
#}
#}
}
# If you wish to use another authentication server than dovecot-auth, you
can # use connect sockets. They assumed to be already running, Dovecot's
master # process only tries to connect to them. They don't need any other
settings # than the path for the master socket, as the configuration is done
elsewhere.
# Note that the client sockets must exist in the login_dir.
#auth external {
# socket connect {
# master {
# path = /var/run/dovecot/auth-master
# }
# }
#}
##
## Dictionary server settings
##
# Dictionary can be used by some plugins to store key=value lists.
# Currently this is only used by dict quota backend. The dictionary can be #
used either directly or though a dictionary server. The following dict block
# maps dictionary names to URIs when the server is used. These can then be #
referenced using URIs in format "proxy:<name>".
dict {
#quota = mysql:/etc/dovecot-dict-quota.conf
}
##
## Plugin settings
##
plugin {
# Here you can give some extra environment variables to mail processes.
# This is mostly meant for passing parameters to plugins. %variable
# expansion is done for all values.
# Quota plugin. Multiple backends are supported:
# dirsize: Find and sum all the files found from mail directory
# dict: Keep quota stored in dictionary (eg. SQL)
# maildir: Maildir++ quota
# fs: Read-only support for filesystem quota
#quota = maildir
# ACL plugin. vfile backend reads ACLs from "dovecot-acl" file from
maildir
# directory. You can also optionally give a global ACL directory path
where
# ACLs are applied to all users' mailboxes. The global ACL directory
contains
# one file for each mailbox, eg. INBOX or sub.mailbox.
#acl = vfile:/etc/dovecot-acls
# Convert plugin. If set, specifies the source storage path which is
# converted to destination storage (default_mail_env).
#convert_mail = mbox:%h/mail
# Trash plugin. When saving a message would make user go over quota, this
# plugin automatically deletes the oldest mails from configured mailboxes
# until the message can be saved within quota limits. The configuration
file
# is a text file where each line is in format: <priority> <mailbox
name>
# Mails are first deleted in lowest -> highest priority number order
#trash = /etc/dovecot-trash.conf
}
Matt Roman
2006-Jul-13 19:41 UTC
[Dovecot] Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable
It appears the problem is in this function:
int net_connect_unix(const char *path)
{
struct sockaddr_un sa;
int fd, ret;
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_UNIX;
if (strocpy(sa.sun_path, path, sizeof(sa.sun_path)) < 0) {
/* too long path */
errno = EINVAL;
return -1;
}
/* create the socket */
fd = socket(PF_UNIX, SOCK_STREAM, 0);
if (fd == -1) {
i_error("socket(%s) failed: %m", path);
return -1;
}
net_set_nonblock(fd, TRUE);
/* connect */
ret = connect(fd, (void *)&sa, sizeof(sa));
if (ret < 0 && errno != EINPROGRESS) {
close_keep_errno(fd);
return -1;
}
return fd;
}
This function is returning -1 and the server is crashing - Most likely because
of a socket error.
The error message from the socket is "Resource temporarily
unavailable"
If anybody knows why that would happen, I might be able figure out a solution.
Thanks!
Timo Sirainen
2006-Aug-10 21:59 UTC
[Dovecot] Error: imap-login: Can't connect to auth server at default: Resource temporarily unavailable
On Wed, 2006-07-12 at 15:33 -0400, Matt Roman wrote:> So I just upgraded from Dovecot 0.99 to the latest 1.0 RC2 because I was > having all sorts of Authentication problems and crashes in 0.99. The upgrade > did not solve the problem apparently. Dovecot still crashes periodically and > always needs to be manually rebooted. > > The log file errors at the time of the crash: > > dovecot: Jul 12 14:30:59 Error: imap-login: Can't connect to auth server at > default: Resource temporarily unavailableIt looks like dovecot-auth is busy doing something. Maybe try growing the auth process count from the default 1. ie.: auth default { .. count = 10 } -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 191 bytes Desc: This is a digitally signed message part URL: <http://dovecot.org/pipermail/dovecot/attachments/20060811/b7c7567e/attachment.bin>