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Obsolete Releases => SME 9.x Contribs => Topic started by: guest22 on April 04, 2017, 02:10:02 PM

Title: 4.4.5_Too_many_connections_from_your_host
Post by: guest22 on April 04, 2017, 02:10:02 PM

Hi,


I need some help in debugging this error messages please:


deferral: Connected_to_xx.xx.xx.xx_but_greeting_failed./Remote_host_said:_421_#4.4.5_Too_many_connections_from_your_host./

SME9.1 + Nextcloud
user1@localdomain mail forwarded to user1@remotedomain
xx.xx.xx.xx = remotedomain mailserver

Nextcloud is sending a notification to user1@localdomain but the mail is only received by user1@remotedomain after many, many hours


TIA

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: Daniel B. on April 04, 2017, 02:57:22 PM

Your server has too many connections at the same time to xx.xx.xx.xx, most likely a burst of email delivery. You can try to reduce concurrency limit to mitigate this

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: guest22 on April 04, 2017, 03:01:54 PM

Thanks. Will give that a try, but it is a very low email volume. Nextcloud is sending out 5 messages (notifications) to 5 different people locally which are forwarded to an external domain..

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: Daniel B. on April 04, 2017, 03:06:17 PM

Some server have a very low concurrency limit. You can try my AltQmail contrib which I've done especially for those cases: with it, you can have a second qmail instance with a very low concurrency limit just for those domains handled by servers with a low limit. With the main qmail keeping its default concurrency limit of 20. See https://wiki.contribs.org/AltQmail

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: guest22 on April 04, 2017, 03:07:27 PM

Thank you for the swift advise and contrib!

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: guest22 on April 04, 2017, 03:17:45 PM

Quote from: Daniel B. on April 04, 2017, 03:06:17 PM

https://wiki.contribs.org/AltQmail (https://wiki.contribs.org/AltQmail)

Daniel,

the how-to says: Not yet for SME9

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: Daniel B. on April 04, 2017, 03:22:23 PM

The page is outdated, it's working on SME9 now, both i386 and x86_64

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: guest22 on April 04, 2017, 03:22:55 PM

Thanks.

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: Jean-Philippe Pialasse on April 04, 2017, 10:52:03 PM

free.fr had a limit of 1 simultaneous connection and only 5 or less per minutes if I remember well... to say it can be very low !

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: gieres on April 05, 2017, 10:58:07 PM

Hello,
For free.fr, I believe it is 2 simultaneous.
Bye.

Title: Re: 4.4.5_Too_many_connections_from_your_host
Post by: Jean-Philippe Pialasse on April 05, 2017, 11:46:22 PM

Quote from: gieres on April 05, 2017, 10:58:07 PM

Hello,
For free.fr, I believe it is 2 simultaneous.
Bye.

indeed 2, and 200 connections/hours and 200 mails/hours