It's not behind a proxy (unless the router is acting as a proxy?). Could it be that my router is doing some Hairpin NAT tomfoolery? The router is generic, so I run into that from time to time with my webserver.

I tried doveadm who, but didn't see anything too peculiar. There is the expect half dozen or so users on common IPs.

Is your server behind proxy maybe? Can you see in logs that you get different IPs? 

Maybe check with `doveadm who` how many connections you have?

Aki

On 27/02/2020 22:44 Esteban L < esteban@little-beak.com> wrote:

I have tried a lot of different things, still no success. =(

here is my dove -n if anyone could help that would be great:

# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf

# Pigeonhole version 0.4.16 (fed8554)

# OS: Linux 4.9.0-12-amd64 x86_64 Debian 9.12

auth_debug = yes

auth_debug_passwords = yes

auth_mechanisms = plain login

auth_verbose = yes

auth_verbose_passwords = yes

mail_home = /var/mail/vmail/%d/%n

mail_location = maildir:~/Mail

mail_max_userip_connections = 500

mail_plugins = " quota"

mail_privileged_group = vmail

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

namespace inbox {

  inbox = yes

  location =

  mailbox Archive {

    auto = subscribe

    special_use = \Archive

  }

  mailbox Drafts {

    auto = subscribe

    special_use = \Drafts

  }

  mailbox Junk {

    auto = subscribe

    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 = maildir:User quota

  quota_grace = 10%%

  quota_rule = *:storage=10G

  quota_rule2 = Trash:storage=+1G

  quota_status_overquota = 552 5.2.2 Mailbox is full

  quota_warning = storage=95%% quota-warning 95 %u

  quota_warning2 = storage=80%% quota-warning 80 %u

  sieve = ~/.dovecot.sieve

  sieve_after = /etc/dovecot/sieve/spamfilter.sieve

  sieve_dir = ~/sieve

}

protocols = " imap lmtp sieve"

service auth {

  unix_listener /var/spool/postfix/private/auth {

    group = postfix

    mode = 0666

    user = postfix

  }

}

service imap-login {

  inet_listener imaps {

    port = 993

    ssl = yes

  }

}

service lmtp {

  unix_listener /var/spool/postfix/private/dovecot-lmtp {

    group = postfix

    mode = 0600

    user = postfix

  }

}

ssl = required

ssl_cert = </etc/letsencrypt/live/little-beak.com/fullchain.pem

ssl_key =  # hidden, use -P to show it

userdb {

  args = /etc/dovecot/dovecot-sql.conf.ext

  driver = sql

}

protocol lmtp {

  mail_plugins = " quota sieve"

  postmaster_address = *****@little-beak.com

}

protocol lda {

  mail_plugins = " quota sieve"

}

protocol imap {

  mail_max_userip_connections = 500

  mail_plugins = " quota imap_quota"

}

protocol sieve {

  mail_max_userip_connections = 500

}

On 27.02.20 18:54, Esteban L wrote:

I have been haunted by the following error message or months, that we

see using Thunderbird.

Unable to connect to your IMAP server.

You may have exceeded the maximum number of connections to this server.

If so, use the Advanced IMAP Server Settings dialogue to reduce the

number of cached connections.

If I change my location, via a VPN, the error message goes away and I

can connect.

I have edited my /etc/dovcot/conf.d/20-imap.conf file by adding the

following:

>

protocol imap {

  # Space separated list of plugins to load (default is global

mail_plugins).

  mail_plugins = $mail_plugins imap_quota

  # Maximum number of IMAP connections allowed for a user from each IP

address.

  # NOTE: The username is compared case-sensitively.

  mail_max_userip_connections = 500

}

>

And, I still get the error message. I know myself, I have about 8-9

accounts, some with as many as 10 folders (I know each one count's as

it's own mailbox), as does my partner--who would access the internet

from my IP.

Does that number really have to be like 10,000, or something? If so, why

does it start out so small in the first place. If not, what else could I

do to avoid this message going forward??

>

>

>

---
Aki Tuomi