AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting

Question

I\'ve got a quite busy server: PHP (Wordpress) using W3TotalCache APC, Varnish for Apache and Cloudflare to handle all traffic. Ubuntu 14.04.4 LTS

Only one website with

Answer 1

You may want to check your webserver access log. You may be the target of an xml-rpc attack in case the log is flooded with xml-rpc posts(e.g. "POST /xmlrpc.php HTTP/1.1" 200 403). There are various ways to prevent it from happening, but Wordpress is prone to this.