Re: Issue with one user only, exceeding connections

Ahhh, Ok, I did not know that and now that makes sense. I did not realize it held a open connection for each folder. I increased that and I will see what happens. I wonder if that will also effect the outlook issues. Thanks! - Jeremy

On 6/8/2022 14:28, Frank-Ulrich Sommer wrote:

I think if IMAP IDLE is used you need one connection per folder. If I remember correctly at least either Thunderbird or K9 Mail (I'm using both too) use one connection per selected directory. Simply increasing the number of connections was the easiest solution as I only have very few users too.

Regards Frank

Am 8. Juni 2022 21:14:23 MESZ schrieb Jeremy Schaeffer kb9mfd@phonesplus.biz:

I keep having this issue with one user, and I have to restart dovecot
several times a day to clear it. What I have is a postfix / dovecot mail
server (Centos 7) and about a dozen users. All mailboxes are imap ssl. I
monitor about 4 mailboxes on my computer and tablet. I use Thunderbird
on the computer (cache connections at 2) and K9 on the tablet, but one
user of the four I keep getting "Maximum number of connections from
user+IP exceeded" and I have the maximum at 50
"(mail_max_userip_connections=50)" so its hard for me to believe I am
actually exceeding it unless dovecot/client is not dropping connections
and keeps starting new ones until it reaches the maximum, but again,
only for one user, even though I am monitoring 4 on the same devices.
Any idea how to troubleshoot this? I don't know if I should be looking
at dovecot or the clients, or what I need to look for. It's been going
on since I put this server in use over a year ago. I also have issues
with Outlook clients disconnecting, just outlook, is there any
recommended settings to make Outlook work smoother?

Thanks! - Jeremy

Config -

# 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-1160.11.1.el7.x86_64 x86_64 CentOS Linux release
7.9.2009 (Core)
# Hostname: ***
auth_mechanisms = plain login
debug_log_path = /var/log/dovecot_debug.log
first_valid_gid = 500
last_valid_gid = 600
last_valid_uid = 600
listen = *
mail_location = maildir:~/Maildir
mbox_write_locks = fcntl
namespace inbox {
    inbox = yes
    location =
    mailbox Drafts {
      special_use = \Drafts
    }
    mailbox Junk {
      special_use = \Junk
    }
    mailbox Sent {
      special_use = \Sent
    }
    mailbox "Sent Messages" {
      special_use = \Sent
    }
    mailbox Trash {
      special_use = \Trash
    }
    prefix = INBOX.
    separator = .
}
passdb {
    driver = pam
}
pop3_uidl_format = %f
protocols = imap lmtp
service auth {
    unix_listener /var/spool/postfix/private/auth {
      group = postfix
      mode = 0660
      user = postfix
    }
}
service imap-login {
    inet_listener imap {
      port = 143
    }
    inet_listener imaps {
      port = 993
      ssl = yes
    }
    process_min_avail = 1
    service_count = 0
}
service imap {
    process_limit = 1024
}
service lmtp {
    unix_listener lmtp {
      mode = 0666
    }
}
ssl = required
ssl_cert = <***
ssl_cipher_list = ECDHE-RSA-CHACHA20-POLY1305:ALL:!LOW:!SSLv2:!EXP:!aNULL
ssl_key =  # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
userdb {
    driver = passwd
}
protocol imap {
    mail_max_userip_connections = 50
}

-- Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail gesendet.