max number of connections per ip

[Esteban L]

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.

On 27.02.20 21:49, Aki Tuomi wrote:
> 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 at little-beak.com
>> <mailto:esteban at 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
>> <mailto:*****@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
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