Hello Mike,
Same thing here with one of our servers on the last week, but it only
affected
IMAP service and local connections.
The dovecot was not responding about 10% of attempted connections.
We could not find any hints in the logs, and the problem was unrelated to
connections limit or dovecot configuration (we also tried the default
setting).
Nothing solved the problem (service restart, default config, etc) only a
server
reboot.
CentOS 6.6 x64
Dovecot 2.2.18
*Victor Benincasa*
CIO / CTO :: Networks, Apps, Systems, Security, High-end support
On 02/06/2015 04:35, Mike Eriksson wrote:
Hi!
I have problem with the pop3 service stops responding at random intervals
on my server. We started to notice this problem as we're running icinga to
check the imap & pop3 service.
When icinga reports that the service is down. We try to telnet to the
server on port 110 but it refuses the connection.
I've checked the netstat during this time and it's listens on port 110. My
first thought we were hitting the max connections and similar.
Changed login_max_connections from 128 to 256. Didnt solve the problem.
Started the debug on the dovecot server but could not see anything in the
logs. Also the error log or the syslog dosnt report anything that I can see.
Best thing would of course be to start and upgrade the software and
os(Debian 5) but I'm not comfortable upgrading it at the moment as my
knowledge about dovecot / postfix isn't great.
Do you have any idéas how to move forward?
dovecot -n
# 1.0.15: /etc/dovecot/dovecot.conf
base_dir: /var/run/dovecot/
log_path: /var/log/dovecot-error.log
info_log_path: /var/log/dovecot-info.log
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: pop3 imap imaps pop3s
ssl_cipher_list: ALL:!LOW
disable_plaintext_auth: no
login_dir: /var/run/dovecot//login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
login_max_processes_count: 256
first_valid_uid: 1090
last_valid_uid: 1090
first_valid_gid: 1090
last_valid_gid: 1090
mail_privileged_group: mail
mail_location: maildir:~/Maildir
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %08Xu%08Xv
auth default:
username_chars:
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@%
username_translation: %@
username_format: %Lu
passdb:
driver: sql
args: /etc/dovecot/dovecot-sql.conf
userdb:
driver: passwd
userdb:
driver: sql
args: /etc/dovecot/dovecot-sql.conf
socket:
type: listen
client:
path: /var/spool/postfix/private/auth
mode: 432
user: postfix
group: postfix
master:
path: /var/run/dovecot/auth-master
mode: 384
user: vmail
group: vmail
plugin:
quota: maildir
sieve_global_path: /etc/dovecot/sieve_scripts/spam-sort.sieve
login_max_processes_count: 256
login_max_connections: 256
max_mail_processes: 1024
Best Regards
Mike
