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can't apply process slot

Madness

Basic Pleskian
Hi guys im suddenly seeing this in my error log not sure what i need to change

mod_fcgid: can't apply process slot for /var/www/cgi-bin/cgi_wrapper/cgi_wrapper
 
Hi,

I have the same problem since I have upgraded Plesk to 12.5, but only for one domain.
Sometimes it's loading very slowly (but not for everybody), and sometimes fails with 503 error service temporarly unavailable.

As described, I increased the FcgidMaxProcesses value to 500 and restarted Apache.
Also, I installed Nginx and PHP-FPM components :

upload_2016-6-1_12-36-29.png

But the problem is still there.
 
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