Hello everyone, we have a huge problem with dovecot and IMAP connections. we got the following errors: 39665 today dovecot: imap-login: Error: master(imap): net_connect_unix(imap) failed: Resource temporarily unavailable - wiki2.dovecot.org/SocketUnavailable (client-pid=29066, client-id=1755, rip=IP, created 562 msecs ago, received 0/4 bytes) we thinks this may be a problem with authorization take too long? Authorization is not local and with SQL. i found the following in source code of Dovecot: #define SOCKET_CONNECT_RETRY_MSECS 500 #define SOCKET_CONNECT_RETRY_WARNING_INTERVAL_SECS 2 [...] i_error("master(%s): %s (client-pid=%u, client-id=%u, rip=%s, created %u msecs ago, received %u/%zu bytes)", This is no process limit problem: ps auxf | grep -c "[d]ovecot/imap$" 688 ps auxf | grep -c "[d]ovecot/imap-login$" 100 cat /proc/`pidof dovecot`/limits Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 8388608 unlimited bytes Max core file size 0 unlimited bytes Max resident set unlimited unlimited bytes Max processes 64053 64053 processes Max open files 65535 65535 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 64053 64053 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0 Max realtime timeout unlimited unlimited us ulimit -n 1024 dovecot --version 2.3.4.1 (f79e8e7e4) protocols = imap pop3 service imap-login { process_min_avail = 4 service_count = 0 } service imap { process_limit = 4096 } service pop3-login { process_min_avail = 4 service_count = 0 } service pop3 { process_limit = 4096 } Can someone explain why we got this error and how to fix? If you need another information please tell me. -- Philipp Ewald Administrator DigiOnline GmbH, Probsteigasse 15 - 19, 50670 K?ln E-Mail: philipp.ewald at digionline.de Web: digionline.de, webweaver.de AG K?ln HRB 27711, St.-Nr. 5215 5811 0640 Gesch?ftsf?hrer: Werner Grafenhain Informationen zum Datenschutz: digionline.de/ds
Hi Philips,
I have the same error after upgrade from dovecot 2.2 to dovecot 2.3,
could be related to "service stats",
try to grep in the dovecot.log for "reached" and look for an error
like:
dovecot: master: Warning: service(stats): client_limit (1000) reached,
client connections are being dropped
If you find it add to 10-master.conf:
service stats {
? client_limit = 10240
? unix_listener stats-writer {
??? mode = 0660
??? #user = vmail
??? #group = vmail
? }
}
then restart dovecot.
Let me know if you solve or find others limit reached in the log.
Ciao
Il 31/03/20 18:22, Philipp Ewald ha scritto:> Hello everyone,
>
> we have a huge problem with dovecot and IMAP connections.
>
> we got the following errors: 39665 today
>
> dovecot: imap-login: Error: master(imap): net_connect_unix(imap)
> failed: Resource temporarily unavailable -
> wiki2.dovecot.org/SocketUnavailable (client-pid=29066,
> client-id=1755, rip=IP, created 562 msecs ago, received 0/4 bytes)
>
> we thinks this may be a problem with authorization take too long?
> Authorization is not local and with SQL.
>
> i found the following in source code of Dovecot:
> #define SOCKET_CONNECT_RETRY_MSECS 500
> #define SOCKET_CONNECT_RETRY_WARNING_INTERVAL_SECS 2
> [...]
> i_error("master(%s): %s (client-pid=%u, client-id=%u, rip=%s, created
> %u msecs ago, received %u/%zu bytes)",
>
> This is no process limit problem:
>
> ps auxf | grep -c "[d]ovecot/imap$"
> 688
>
> ps auxf | grep -c "[d]ovecot/imap-login$"
> 100
>
>
> cat /proc/`pidof dovecot`/limits
> Limit???????????????????? Soft Limit?????????? Hard Limit?????????? Units
> Max cpu time????????????? unlimited unlimited??????????? seconds
> Max file size???????????? unlimited unlimited??????????? bytes
> Max data size???????????? unlimited unlimited??????????? bytes
> Max stack size??????????? 8388608 unlimited??????????? bytes
> Max core file size??????? 0 unlimited??????????? bytes
> Max resident set????????? unlimited unlimited??????????? bytes
> Max processes???????????? 64053 64053??????????????? processes
> Max open files??????????? 65535 65535??????????????? files
> Max locked memory???????? 65536 65536??????????????? bytes
> Max address space???????? unlimited unlimited??????????? bytes
> Max file locks??????????? unlimited unlimited??????????? locks
> Max pending signals?????? 64053 64053??????????????? signals
> Max msgqueue size???????? 819200 819200?????????????? bytes
> Max nice priority???????? 0??????????????????? 0
> Max realtime priority???? 0??????????????????? 0
> Max realtime timeout????? unlimited unlimited??????????? us
>
> ulimit -n
> 1024
>
>
> dovecot --version
> 2.3.4.1 (f79e8e7e4)
>
>
> protocols = imap pop3
> service imap-login {
> ? process_min_avail = 4
> ? service_count = 0
> }
> service imap {
> ? process_limit = 4096
> }
> service pop3-login {
> ? process_min_avail = 4
> ? service_count = 0
> }
> service pop3 {
> ? process_limit = 4096
> }
>
>
>
> Can someone explain why we got this error and how to fix? If you need
> another information please tell me.
>
>
--
Alessio Cecchi
Postmaster @ qboxmail.it
linkedin.com/in/alessice
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This was this issue Thank you! On 04.04.20 10:48, Alessio Cecchi wrote:> Hi Philips, > > I have the same error after upgrade from dovecot 2.2 to dovecot 2.3, could be related to "service stats", > > try to grep in the dovecot.log for "reached" and look for an error like: > > dovecot: master: Warning: service(stats): client_limit (1000) reached, client connections are being dropped > > If you find it add to 10-master.conf: > > service stats { > ? client_limit = 10240 > ? unix_listener stats-writer { > ??? mode = 0660 > ??? #user = vmail > ??? #group = vmail > ? } > } > > then restart dovecot. > > Let me know if you solve or find others limit reached in the log. > > Ciao > > Il 31/03/20 18:22, Philipp Ewald ha scritto: >> Hello everyone, >> >> we have a huge problem with dovecot and IMAP connections. >> >> we got the following errors: 39665 today >> >> dovecot: imap-login: Error: master(imap): net_connect_unix(imap) failed: Resource temporarily unavailable - wiki2.dovecot.org/SocketUnavailable (client-pid=29066, client-id=1755, rip=IP, created 562 msecs ago, received 0/4 bytes) >> >> we thinks this may be a problem with authorization take too long? Authorization is not local and with SQL. >> >> i found the following in source code of Dovecot: >> #define SOCKET_CONNECT_RETRY_MSECS 500 >> #define SOCKET_CONNECT_RETRY_WARNING_INTERVAL_SECS 2 >> [...] >> i_error("master(%s): %s (client-pid=%u, client-id=%u, rip=%s, created %u msecs ago, received %u/%zu bytes)", >> >> This is no process limit problem: >> >> ps auxf | grep -c "[d]ovecot/imap$" >> 688 >> >> ps auxf | grep -c "[d]ovecot/imap-login$" >> 100 >> >> >> cat /proc/`pidof dovecot`/limits >> Limit???????????????????? Soft Limit?????????? Hard Limit?????????? Units >> Max cpu time????????????? unlimited unlimited??????????? seconds >> Max file size???????????? unlimited unlimited??????????? bytes >> Max data size???????????? unlimited unlimited??????????? bytes >> Max stack size??????????? 8388608 unlimited??????????? bytes >> Max core file size??????? 0 unlimited??????????? bytes >> Max resident set????????? unlimited unlimited??????????? bytes >> Max processes???????????? 64053 64053??????????????? processes >> Max open files??????????? 65535 65535??????????????? files >> Max locked memory???????? 65536 65536??????????????? bytes >> Max address space???????? unlimited unlimited??????????? bytes >> Max file locks??????????? unlimited unlimited??????????? locks >> Max pending signals?????? 64053 64053??????????????? signals >> Max msgqueue size???????? 819200 819200?????????????? bytes >> Max nice priority???????? 0??????????????????? 0 >> Max realtime priority???? 0??????????????????? 0 >> Max realtime timeout????? unlimited unlimited??????????? us >> >> ulimit -n >> 1024 >> >> >> dovecot --version >> 2.3.4.1 (f79e8e7e4) >> >> >> protocols = imap pop3 >> service imap-login { >> ? process_min_avail = 4 >> ? service_count = 0 >> } >> service imap { >> ? process_limit = 4096 >> } >> service pop3-login { >> ? process_min_avail = 4 >> ? service_count = 0 >> } >> service pop3 { >> ? process_limit = 4096 >> } >> >> >> >> Can someone explain why we got this error and how to fix? If you need another information please tell me. >> >> > -- > Alessio Cecchi > Postmaster @http://www.qboxmail.it > linkedin.com/in/alessice >-- Philipp Ewald Administrator DigiOnline GmbH, Probsteigasse 15 - 19, 50670 K?ln Fax: +49 221 6500-690, E-Mail: philipp.ewald at digionline.de Web: digionline.de, webweaver.de AG K?ln HRB 27711, St.-Nr. 5215 5811 0640 Gesch?ftsf?hrer: Werner Grafenhain Informationen zum Datenschutz: digionline.de/ds
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