[Dovecot] Anvil client_limit reached

[Juergen Obermann]

Hello,

we have the following problem:

Nov  3 09:43:33 minerva dovecot: [ID 583609 local0.warning] master: Warning: service(anvil): client_limit reached, client connections are being dropped
Nov  3 09:51:33 minerva dovecot: [ID 583609 local0.error] imap-login: Error: net_connect_unix(anvil) failed: Connection refused
Nov  3 09:51:33 minerva dovecot: [ID 583609 local0.crit] imap-login: Fatal: Couldn't connect to anvil
Nov  3 09:52:42 minerva dovecot: [ID 583609 local0.error] pop3-login: Error: net_connect_unix(anvil) failed: Connection refused
Nov  3 09:52:42 minerva dovecot: [ID 583609 local0.crit] pop3-login: Fatal: Couldn't connect to anvil
Nov  3 09:52:42 minerva dovecot: [ID 583609 local0.error] imap-login: Error: net_connect_unix(anvil) failed: Connection refused
Nov  3 09:52:42 minerva dovecot: [ID 583609 local0.crit] imap-login: Fatal: Couldn't connect to anvil

At that time I counted 2030 imap processes from 995 users and 1106 imap-login processes. What can I do to set an appropriate client_limit for anvil?

The configuration is:

# doveadm config -n        
# 2.0.5: /opt/local/etc/dovecot/dovecot.conf
# OS: SunOS 5.10 sun4v  
auth_verbose = yes
default_client_limit = 3000
default_process_limit = 300
disable_plaintext_auth = no
listen = xxx.xxx.uni-giessen.de localhost
mail_fsync = always
mail_location = mbox:~/Mail:INBOX=/var/mail/%u
mail_nfs_index = yes
mail_nfs_storage = yes
mail_plugins = quota
mmap_disable = yes
namespace {
  inbox = yes
  location = 
  prefix = 
  separator = /
  type = private
}
namespace {
  hidden = yes
  list = no
  location = 
  prefix = Mail/
  separator = /
  subscriptions = yes
  type = private
}
passdb {
  driver = pam
}
postmaster_address = postmaster at hrz.uni-giessen.de
protocols = imap pop3
service auth {
  client_limit = 5720
}
service imap {
  process_limit = 4096
}
ssl_cert = </etc/ssl/server.crt
ssl_key = </etc/ssl/server.key
syslog_facility = local0
userdb {
  driver = passwd
}
verbose_proctitle = yes
version_ignore = yes
protocol imap {
  imap_client_workarounds = delay-newmail tb-extra-mailbox-sep
  mail_max_userip_connections = 20
  mail_plugins = quota imap_quota
}
protocol pop3 {
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xv%08Xu
}
minerva{root}2509:/
# grep anvil /var/log/locallog

minerva{root}2510:/

-- 
Hochschulrechenzentrum der | Mail: Juergen.Obermann at hrz.uni-giessen.de
Justus-Liebig-Universitaet | WWW:  http://www.uni-giessen.de/obermann
Heinrich-Buff-Ring 44      | Tel:  0641-99-13054 (0641-99-13001)
D-35392 Giessen, Germany   | Fax:  0641-99-13009