Limit number of connections to server

Valentin V. Bartenev vbart at
Tue Apr 4 20:58:16 UTC 2017

On Tuesday 04 April 2017 17:22:58 Kamil Gorlo wrote:
> Hi,
> is there a way to limit total number of open connections per listening port
> in Nginx? I know that there is limit_conn module but as far as I understand
> it only works on "request" layer, which means connections are counted only
> when request headers have been already read.
> I have problem when number of SSL connections to my server is very high
> (CPU is 100% and server becomes unresponsive), and I would like to "cut"
> new connections after some defined threshold is exceeded. It would possibly
> save some CPU cycles needed to handle SSL handshake, etc.
> Is it possible?

You should use system firewall.  Most of *nix systems have one out of the box.

  wbr, Valentin V. Bartenev

More information about the nginx mailing list