Dovecot behind Load Balancer
paolo.daniele at tlcweb.it
Wed Jul 10 11:31:47 EEST 2019
Il 10/07/19 10:27, Aki Tuomi ha scritto:
>> On 10/07/2019 11:24 Paolo Daniele via dovecot <dovecot at dovecot.org> wrote:
>> Il 10/07/19 10:20, Aki Tuomi ha scritto:
>>>> On 12/06/2019 20:02 Paolo Daniele via dovecot <dovecot at dovecot.org> wrote:
>>>> i've a question for you.
>>>> I've two dovecot imap/pop server behind a zen load balancer.
>>>> Load balancing is made by lx4nat so the public ip address of my load balancer contact directly the dovecot servers.
>>>> Since few months i've a message from thunderbird that i've reached the imap limit login for ip.
>>>> I've triend to increase the max user ip parameter but sometimes i've the same problem.
>>>> It's a strange things that actually i'm able to mitigate by reduce the number of cached connections in Thunderbird but it's not normal.
>>>> What do you think about that?
>>>> Maybe there's some tuning that you can suggest.
>>>> Thank you,
>>> Have you ensured, by checking logs, that the connections are seen by dovecot to come from public IP addresses?
>>> Also, thunderbird is known to open lots of concurrent connections.
>> connections are coming from the ip address of load balancer (also
>> checked with a netstat -an)
>> I know that thunderbird has this problem and i haven't problem since the
>> numbers of email domain increase.
>> I'm not sure the impact of rising the max user ip to an higher value in
>> terms of ram consumption and cpu
>> Any suggestion?
>> Thanks for your answer!
> What's your current limit? The default value is 100.
mail_max_userip_connections = 500
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