1 Topic by shufilk

  • shufilk
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Topic: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.6
- Linux/BSD distribution name and version: Ubuntu 14.04.3 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySql
- Web server (Apache or Nginx):Apache
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue: warning: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180] for service submission
====

Hello,

I getting this issue ,
Connection concurrency limit exceeded: 51 from unknown[192.162.100.180] for service submission

How to increase concurrent connection .


Please advice me .

Regards,
Shufil

----

Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

Open file /etc/postfix/master.cf, you will find this:

# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
# ==========================================================================
...
submission inet n       -       n       -       -       smtpd
...

You may need to increase the "maxproc" setting.

Or, adding setting 'submission_destination_concurrency_limit = 200' (replace 200 by the limit you want) in /etc/postfix/main.cf should work the same.

3 Reply by shufilk

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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

ZhangHuangbin wrote:

Open file /etc/postfix/master.cf, you will find this:

# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
# ==========================================================================
...
submission inet n       -       n       -       -       smtpd
...

You may need to increase the "maxproc" setting.

Or, adding setting 'submission_destination_concurrency_limit = 200' (replace 200 by the limit you want) in /etc/postfix/main.cf should work the same.

_________________

I have enabled main.cf submission_destination_concurrency_limit = 200 , but i getting Waring that is
postconf: warning: /etc/postfix/main.cf: unused parameter: submission_destination_concurrency_limit=200
/usr/sbin/postconf: warning: /etc/postfix/main.cf: unused parameter: submission_destination_concurrency_limit=200

then after i have remove submission entry from main.cf and added master.cf like below
submission inet n       -       n       -       200       smtpd

after restart postfix 587 not connecting .

4 Reply by shufilk

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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

its started work with 587 . will update you.


Thanks.

5 Reply by shufilk (edited by shufilk 2017-05-15 13:51:22)

  • shufilk
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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

ZhangHuangbin wrote:

Open file /etc/postfix/master.cf, you will find this:

# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
# ==========================================================================
...
submission inet n       -       n       -       -       smtpd
...

You may need to increase the "maxproc" setting.

Or, adding setting 'submission_destination_concurrency_limit = 200' (replace 200 by the limit you want) in /etc/postfix/main.cf should work the same.

_____________________________

I have added submission inet n       -       n       -       -       smtpd in master.cf but its not workign for my requirment ,
also i have added submission_destination_concurrency_limit = 200 in main.cf - its not supporting in postfix , after that i have added below settings in main.cf and its working as required .

smtpd_client_connection_count_limit = 500
smtpd_client_connection_rate_limit = 500

Regards,
Shufil

6 Reply by ZhangHuangbin

  • ZhangHuangbin
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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

shufilk wrote:

I have added submission inet n       -       n       -       -       smtpd in master.cf but its not workign

Not just add this line, you must increase the "maxproc" column. Did you increase it to a proper value? e.g. 500 in your case.

7 Reply by shufilk (edited by shufilk 2017-05-15 15:01:54)

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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

ZhangHuangbin wrote:
shufilk wrote:

I have added submission inet n       -       n       -       -       smtpd in master.cf but its not workign

Not just add this line, you must increase the "maxproc" column. Did you increase it to a proper value? e.g. 500 in your case.


maxproc i have added 200 first, submission inet n       -       n       -       200       smtpd

I have tested first with 200 , but again getting same issue , may be i need to add to 500 as per my connection .

Regards,
Shufil

8 Reply by ZhangHuangbin

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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

shufilk wrote:

I have tested first with 200 , but again getting same issue , may be i need to add to 500 as per my connection .

You should try it.

9 Reply by shufilk

  • shufilk
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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

ZhangHuangbin wrote:
shufilk wrote:

I have tested first with 200 , but again getting same issue , may be i need to add to 500 as per my connection .

You should try it.

Zhang,

Both setting same or any difference , means
smtpd_client_connection_count_limit = 500
smtpd_client_connection_rate_limit = 500

and

maxproc  in master.cf


Regards,
Shufil

10 Reply by ZhangHuangbin

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Re: Connection concurrency limit exceeded: 51 from unknown[192.162.100.180

Comment out the settings in main.cf, but update master.cf with proper value for 'maxproc'.