Imapd - more processes than maxchild

Fabio S. Schmidt fabio at
Thu Jul 31 18:59:55 EDT 2014

Hi Andrew,

Thanks for the quick answer. I greatly appreciate it.

I have already done all these checks and there are actually more than 2000
valid users trying to connect from different IP addresses.


On 31 July 2014 19:49, Andrew Morgan <morgan at> wrote:

> On Thu, 31 Jul 2014, Fabio S. Schmidt wrote:
>  Hi !
>> I'm trying to fix an environment which has been growing without proper
>> attention.
>> There are about 7000 inboxes but only 5000 are active and the maxchilds
>> parameter is set as "2000" causing a lot of timeouts when the clients try
>> to connect. I thought as a first approach trying to increase this
>> parameter.
>> I have noticed that even with the "maxchilds" parameter set as "2000"
>> there
>> are about 2020 processes open, is this behaviour normal?  The version in
>> use is 2.4.12.
> Are there really 2000+ IMAP clients trying to connect?  Try "ps -ef | grep
> imapd | wc -l".
> It's also possible that there is an IMAP client running wild, making
> hundreds of connections.  The output of "netstat -nt" might show you if
> there are a lot of connections from a single IP address.
> If you really need to allow more connections, increase the maxchilds
> parameter.  Beware that you don't overload the server, either with too much
> I/O or not enough RAM available!  :)
>         Andy


My best regards,
Fabio Soares Schmidt

Linux Professional Institute - LPIC-3
Microsoft Certified Technology Specialist: Active Directory
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