Re: [exim] 421 too many concurrent sessions

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Autor: The Doctor
Fecha:  
A: Chris Siebenmann
Cc: exim-users
Asunto: Re: [exim] 421 too many concurrent sessions
On Tue, Jan 24, 2017 at 12:34:23PM -0500, Chris Siebenmann wrote:
> > I cannot find the culprit doing this.
> >
> > Using Exim 4.88 on FreeBSD 11 I placed this into my configuration:
> [...]
> > smtp_accept_max = 10
>
> Well, you have a limit of 10 simultaneous SMTP connections period.
> Once you have ten active ones, any further connections will get this
> message.
>
> > smtp_accept_max_per_host = 5
>
> ... and a single IP can only have five connections at once.
>
> Note that despite the names being very similar to each other,
> 'smtp_accept_max_per_connection' means something completely
> different than 'smtp_accept_max_per_host'. One is about limits
> on SMTP connections, one is about limits on MAIL commands within
> a single connection.
>
> If your problem is that you cannot see where the connections
> are coming from, look at what 'exiwhat' reports, as well as
> ps, netstat, lsof, and other similar tools for looking at
> network connections.
>
>     - cks


Provided that the server can respond.

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