Maxim Dounin
January 21, 2014 06:40AM

On Mon, Jan 20, 2014 at 05:31:30PM -0500, bidwell wrote:

> I have nginx proxying imap and pop between 3 different backend servers, but
> it seems to be limited to about 210 concurrent connections. Requests beyond
> this get a connection timed out. I tried adding more worker processes but
> that didn't do anything. I have multi_accept on and have raised the number
> of worker_connections, but still no luck. I see rate limiting and
> connection bandwidth limiting, but these appear to apply to the http
> protocol and not the imap/pop protocol. What parameters to I adjust to
> increase the number of concurrent sessions to imap/pop?

In nginx itself, tuning worker_connections should be enough. If
it doesn't help, it indicate the problem is elsewhere - i.e. you
either have to tune some system limit (try looking into error log
to see if there is something there) or your backend servers.

Maxim Dounin

nginx mailing list
Subject Author Posted

imap proxy limited to about 210 connections

bidwell January 20, 2014 05:31PM

Re: imap proxy limited to about 210 connections

Maxim Dounin January 21, 2014 06:40AM

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