Issue with one user only, exceeding connections

[Jeremy Schaeffer]

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 at 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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://dovecot.org/pipermail/dovecot/attachments/20220608/a253e059/attachment-0001.htm>