There is an error on a WordPress SSL site in my VPS server that is generating almost every couple of minutes.
It is causing high load CPU usage.
The Error from apache log:
[core:error] [pid 15166] [client wp.website.ip.here:50529] AH00524: Handler for fastcgi-script returned invalid result code 32, referer: https://www.mywebsite.com/wp-cron.php?doing_wp_cron=1490800265.2045660018920898437500
The issue is that this the only error I can see, so I cannot understand what is causing it.
Apache v2.4.10 (Debian Jessie)
Anyone has seen this error before?
How to find what is causing it?
UPDATE: I have noticed that the error started after switching to SSL. Before that there wasn't such error in log.