Hello,

sorry, forget put my configuration

Default client limit is 1024

dovecot -n: # 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () # OS: Linux 4.19.0-12-amd64 x86_64 Debian 10.7 # Hostname: vhermes.local auth_mechanisms = plain login default_client_limit = 1024 deliver_log_format = from=<%f>: %$ dict { quota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext } disable_plaintext_auth = no first_valid_gid = 114 first_valid_uid = 111 last_valid_gid = 114 last_valid_uid = 111 lda_mailbox_autocreate = yes listen = * mail_fsync = never mail_location = maildir:~/Maildir mail_plugins = quota mail_privileged_group = mail managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext vacation-seconds mmap_disable = yes namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { quota = dict:User quota::proxy::quota quota_exceeded_message = User quota exceed quota_grace = 20%% quota_warning = storage=99%% quota-warning 99 %u quota_warning2 = storage=95%% quota-warning 95 %u quota_warning3 = storage=90%% quota-warning 90 %u quota_warning4 = storage=80%% quota-warning 80 %u quota_warning5 = storage=75%% quota-warning 75 %u sieve = file:~/sieve;active=~/.dovecot.sieve sieve_extensions = +vacation-seconds sieve_vacation_default_period = 0 sieve_vacation_max_period = 1d sieve_vacation_min_period = 0 } protocols = " imap lmtp sieve pop3" service anvil { client_limit = 3448 } service auth { client_limit = 10100 unix_listener /var/spool/postfix/private/auth { mode = 0666 } unix_listener auth-userdb { mode = 0666 } vsz_limit = 512 M } service dict { unix_listener dict { group = vmail mode = 0600 user = vmail } } service imap-login { client_limit = 2048 process_limit = 1000 service_count = 0 vsz_limit = 1 G } service imap { client_limit = 1 process_limit = 8192 process_min_avail = 8 service_count = 100 } service lmtp { executable = lmtp -L process_min_avail = 5 unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } user = vmail } service managesieve-login { inet_listener sieve { port = 4190 } process_min_avail = 0 service_count = 0 vsz_limit = 100 M } service pop3-login { process_limit = 512 service_count = 0 } service pop3 { client_limit = 1 process_limit = 1024 service_count = 1 } service quota-warning { executable = script /etc/dovecot/quota-warning.sh unix_listener quota-warning { user = vmail } user = vmail } service stats { unix_listener stats-reader { group = vmail mode = 0666 user = vmail } unix_listener stats-writer { user = vmail } } ssl_cert =

st 9. 12. 2020 v 8:27 odesílatel Aki Tuomi aki.tuomi@open-xchange.com napsal:

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On 09/12/2020 09:24 Lampa lampacz@gmail.com wrote:

Hello,

after debian version from 9 to, also dovecot was upgraded. There was problems with right imap and imap-login connection settings. I adjusted process_limit, service count increased /proc/sys/net/core/somaxconn from 128 to 1024 for imap

It's a system with 1000+ imap and 200+ pop3 connections. When imap connections are over 1000 problems begins.

Problem one: 2020-12-07T12:46:39.575586+01:00 vhermes dovecot: master: Error: service(pop3): Initial status notification not received in 30 seconds, killing the process 2020-12-07T12:46:39.576448+01:00 vhermes dovecot: pop3: Fatal: master: service(pop3): child 13975 killed with signal 9 2020-12-07T12:46:42.015726+01:00 vhermes dovecot: master: Error: service(lmtp): Initial status notification not received in 30 seconds, killing the process 2020-12-07T12:46:42.016680+01:00 vhermes dovecot: lmtp: Fatal: master: service(lmtp): child 13985 killed with signal 9 2020-12-07T12:46:42.061963+01:00 vhermes dovecot: master: Error: service(lmtp): Initial status notification not received in 30 seconds, killing the process 2020-12-07T12:46:42.062973+01:00 vhermes dovecot: lmtp: Fatal: master: service(lmtp): child 13987 killed with signal 9

problem two: 2020-12-07T13:55:43.106017+01:00 vhermes dovecot: pop3: Error: net_connect_unix(/var/run/dovecot/stats-writer) failed: Resource temporarily unavailable 2020-12-07T13:56:22.300893+01:00 vhermes dovecot: lmtp: Error: net_connect_unix(/var/run/dovecot/stats-writer) failed: Resource temporarily unavailable 2020-12-07T13:58:11.721892+01:00 vhermes dovecot: imap: Error: net_connect_unix(/var/run/dovecot/stats-writer) failed: Resource temporarily unavailable

problem three - lot of 2020-12-07T10:16:24.773347+01:00 vhermes dovecot: imap-login: Error: master(imap): net_connect_unix(imap) failed: Resource temporarily unavailable - http://wiki2.dovecot.org/SocketUnavailable

Your client_limit is too low. Try increasing it for these services.

<snip/>

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Seems that last problem is solved (if same) https://github.com/dovecot/core/commit/a668d767a710ca18ab6e7177d8e8be22a6b02...

Thank you for any help

--

Lampa

Aki

-- Lampa