> Le 10 juil. 2019 à 11:46, Paolo Daniele <paolo.dani...@tlcweb.it> a écrit : > > > > Il 10/07/19 11:44, Jean-Daniel Dupas ha scritto: >> >>> Le 10 juil. 2019 à 10:24, Paolo Daniele via dovecot <dovecot@dovecot.org> a >>> écrit : >>> >>> >>> Il 10/07/19 10:20, Aki Tuomi ha scritto: >>>>> On 12/06/2019 20:02 Paolo Daniele via dovecot <dovecot@dovecot.org> wrote: >>>>> >>>>> >>>>> Hi, >>>>> 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, >>>>> Paolo >>>>> >>>> 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. >>>> >>>> Aki >>> Yes, >>> connections are coming from the ip address of load balancer (also checked >>> with a netstat -an) >> If connection are seen as coming from the IP address of the load balancer, >> isn't it normal that dovecot complains ? >> That means that dovecot sees all connections as coming from a single client, >> which would explain why you reach that limit. >> >> > Yeah of course, but i've checked that i haven't reach the max_user_per_ip > limit by counting dovecot process coming from that ip address. > So the strange and the reason why i'm writing to you :)
Don't know if this is still relevant in your dovecot version, but did you see this: https://serverfault.com/questions/385187/dovecot-ignoring-maximum-number-of-imap-connections <https://serverfault.com/questions/385187/dovecot-ignoring-maximum-number-of-imap-connections> People had some issue by using the mail_max_userip_connections in the imap section and had to set it in the global section instead.