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Is your server behind proxy maybe? Can you see in logs that you get different
IPs?
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Maybe check with `doveadm who` how many connections you have?
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Aki
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On 27/02/2020 22:44 Esteban L <
<a
href="mailto:esteban@little-beak.com">esteban@little-beak.com</a>>
wrote:
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I have tried a lot of different things, still no success. =(
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<br>
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here is my dove -n if anyone could help that would be great:
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# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf
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# Pigeonhole version 0.4.16 (fed8554)
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# OS: Linux 4.9.0-12-amd64 x86_64 Debian 9.12
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auth_debug = yes
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auth_debug_passwords = yes
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auth_mechanisms = plain login
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auth_verbose = yes
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auth_verbose_passwords = yes
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mail_home = /var/mail/vmail/%d/%n
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mail_location = maildir:~/Mail
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mail_max_userip_connections = 500
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mail_plugins = " quota"
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mail_privileged_group = vmail
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managesieve_notify_capability = mailto
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managesieve_sieve_capability = fileinto reject envelope
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encoded-character vacation subaddress comparator-i;ascii-numeric
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relational regex imap4flags copy include variables body enotify
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environment mailbox date index ihave duplicate mime foreverypart extracttext
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namespace inbox {
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inbox = yes
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location </div>
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mailbox Archive {
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auto = subscribe
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special_use = \Archive
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}
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mailbox Drafts {
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auto = subscribe
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special_use = \Drafts
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}
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mailbox Junk {
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auto = subscribe
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special_use = \Junk
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}
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mailbox Sent {
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auto = subscribe
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special_use = \Sent
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}
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mailbox "Sent Messages" {
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special_use = \Sent
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}
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mailbox Trash {
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auto = subscribe
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special_use = \Trash
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}
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prefix </div>
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}
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passdb {
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args = /etc/dovecot/dovecot-sql.conf.ext
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driver = sql
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}
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plugin {
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quota = maildir:User quota
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quota_grace = 10%%
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quota_rule = *:storage=10G
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quota_rule2 = Trash:storage=+1G
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quota_status_overquota = 552 5.2.2 Mailbox is full
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quota_warning = storage=95%% quota-warning 95 %u
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quota_warning2 = storage=80%% quota-warning 80 %u
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sieve = ~/.dovecot.sieve
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sieve_after = /etc/dovecot/sieve/spamfilter.sieve
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sieve_dir = ~/sieve
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}
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protocols = " imap lmtp sieve"
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service auth {
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unix_listener /var/spool/postfix/private/auth {
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group = postfix
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mode = 0666
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user = postfix
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}
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}
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service imap-login {
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inet_listener imaps {
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port = 993
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ssl = yes
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}
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}
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service lmtp {
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unix_listener /var/spool/postfix/private/dovecot-lmtp {
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group = postfix
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mode = 0600
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user = postfix
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}
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}
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ssl = required
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ssl_cert = </etc/letsencrypt/live/little-beak.com/fullchain.pem
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ssl_key = # hidden, use -P to show it
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userdb {
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args = /etc/dovecot/dovecot-sql.conf.ext
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driver = sql
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}
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protocol lmtp {
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mail_plugins = " quota sieve"
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postmaster_address =
<a
href="mailto:*****@little-beak.com">*****@little-beak.com</a>
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}
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protocol lda {
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mail_plugins = " quota sieve"
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}
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protocol imap {
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mail_max_userip_connections = 500
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mail_plugins = " quota imap_quota"
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}
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protocol sieve {
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mail_max_userip_connections = 500
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}
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<br>
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On 27.02.20 18:54, Esteban L wrote:
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I have been haunted by the following error message or months, that we
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see using Thunderbird.
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Unable to connect to your IMAP server.
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You may have exceeded the maximum number of connections to this server.
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If so, use the Advanced IMAP Server Settings dialogue to reduce the
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number of cached connections.
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</blockquote>
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If I change my location, via a VPN, the error message goes away and I
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can connect.
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<blockquote type="cite">
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I have edited my /etc/dovcot/conf.d/20-imap.conf file by adding the
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following:
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>
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protocol imap {
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# Space separated list of plugins to load (default is global
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mail_plugins).
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mail_plugins = $mail_plugins imap_quota
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# Maximum number of IMAP connections allowed for a user from each IP
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address.
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# NOTE: The username is compared case-sensitively.
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mail_max_userip_connections = 500
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}
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>
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<blockquote type="cite">
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And, I still get the error message. I know myself, I have about 8-9
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accounts, some with as many as 10 folders (I know each one count's as
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it's own mailbox), as does my partner--who would access the internet
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from my IP.
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</blockquote>
<blockquote type="cite">
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Does that number really have to be like 10,000, or something? If so, why
</div>
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does it start out so small in the first place. If not, what else could I
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do to avoid this message going forward??
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</blockquote>
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>
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>
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>
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</blockquote>
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<br>
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<div class="io-ox-signature">
<pre>---
Aki Tuomi</pre>
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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-------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200227/2119b8e2/attachment.html>
Naturally, everything works fine if I use a VPN/translocation. 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-------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20200227/2ba911ca/attachment-0001.html>
You can usually see from doveadm who or logs if your router/whatever is doing NAT. Which would be the reason why 500 connections wouldn't be enough. Aki> On 27/02/2020 23:21 Esteban L <esteban at little-beak.com> wrote: > > > > 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> 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 > >