- Website hosted in Plesk server is not accessible under heavy load with the following error in Apache
mod_fcgid: can't apply process slot for /var/www/cgi-bin/cgi_wrapper/cgi_wrapper
Increasing of the FastCGI limits in accordance with the following article does not fix the issue:
Some websites are unavailable: mod_fcgid: can't apply process slot for /var/www/cgi-bin/cgi_wrapper/cgi_wrapper
A website is not accessible with "504 Gateway Time-out": The timeout specified has expired: [client 203.0.113.2:54693] AH01075: Error dispatching request to
CPU usage for the subscription is insufficient and causes requests time out
Increase Cgroup memory limits:
For Plesk Cgroups Manager extension
To increase limits for all subscriptions under a service plan, navigate to Service Plan > Default Domain > RAM, CPU, DISK I/O.
For a single subscription, navigate to Subscriptions > example.com > Customize > RAM, CPU, DISK I/O
Below secion RAM, increase value of Limit or enable checkbox Unlimited
Additional information can be found in (Plesk for Linux) Cgroups Manager documentation.