Hi using dovecot 1.0.10 with pop/imap, using maildir, with 2000+ users mostly using pop but many using imap.
Once in a great while I have problems with dovecot pop timing out. If I telnet to port 110 it just takes forever to come up or it doesn't at all, the samething happens on the imap port although 110 is always worst.
At 1st when troubleshooting I was not sure what was causing the situation and when I ran out of options I stopped postfix. When I did this dovecot immediately started working again, that is port 110/143 came up fast and all the user logins were fast again. When I restarted postfix after a minute or so dovecot became slow again.
While observing this situation I notice that postfix had most of the connections about 300+ in established state, while dovecot was using around 150 connections.
After adjusting some of the parameters on postfix and shutting it down multiple times, suddenly everything worked but this time postfix was reporting over 3000 connections mostly in TIME_WAIT state which is normal for us.
My question is what do you guys think is happening here, what is the relationship between dovecot/postfix that would cause this to happen. I'm just looking for some suggestions in case this happens again.
# 1.0.10: /usr/local/etc/dovecot.conf
protocols: imap pop3
ssl_disable: yes
disable_plaintext_auth: no
login_dir: /usr/local/var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login
login_executable(imap): /usr/local/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
login_greeting: D-V1 NP09 ready.
login_process_size: 384
login_processes_count: 55
login_max_processes_count: 450
mail_location: maildir:/home/%1u/%u/Maildir
maildir_copy_with_hardlinks: yes
maildir_copy_preserve_filename: yes
mail_executable(default): /usr/local/libexec/dovecot/imap
mail_executable(imap): /usr/local/libexec/dovecot/imap
mail_executable(pop3): /usr/local/libexec/dovecot/pop3
mail_plugin_dir(default): /usr/local/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %08Xu%08Xv
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
count: 4
passdb:
driver: shadowuserdb:
driver: passwd