Websites on Plesk server are slow or show error 500 or PHP mail cannot be sent:

[Suhitha]

Question: Websites on Plesk server are slow or show error 500 or PHP mail cannot be sent: ap_pass_brigade failed


Applicable to:

• Plesk for Linux

Symptoms

• Websites on Plesk server are slow or not available, sending emails via PHP script fails with:

Code Select Expand

500 Internal server error


• Domains > exemple.com > Logs or /var/www/vhosts/example.com/logs/error_log show:

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mod_fcgid: ap_pass_brigade failed in handle_request_ipc function, referer: http://www.example.com/index.php

Cause

The connection is being reset due to the FcgidMaxRequestsPerProcess limit has been reached. The parameter was previously defined in the web configuration:

• On RedHat/CentOS/CloudLinux:

# grep FcgidMaxRequestsPerProcess /etc/httpd/conf.d/fcgid.conf /var/www/vhosts/system/example.com/conf/vhost.conf /var/www/vhosts/system/example.com/conf/httpd.conf

• On Ubuntu/Debian:

# grep FcgidMaxRequestsPerProcess /etc/apache2/mods-enabled/fcgid.conf /var/www/vhosts/system/example.com/conf/vhost.conf /var/www/vhosts/system/example.com/conf/httpd.conf


Resolution

                                    Solution for one particular domain

1.Log in to Plesk.

2.Go to Domains > example.com > Apache & nginx Settings > Additional Apache directives.

3.Increase the FcgidMaxRequestsPerProcess parameter value in Additional directives for HTTP and Additional directives for HTTPS fields:

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<IfModule mod_fcgid.c>
FcgidMaxRequestsPerProcess 500
</IfModule>


                                Solution for all domains on the server

1.Connect to the server via SSH.

2.Open /etc/httpd/conf.d/fcgid.conf (on RedHat/CentOS/CloudLinux) or /etc/apache2/mods-enabled/fcgid.conf (on Ubuntu/Debian) using "vi";

3.Increase the value of FcgidMaxRequestsPerProcess parameter, e.g. to 500:

Code Select Expand

<IfModule mod_fcgid.c>
FcgidMaxRequestsPerProcess 500
</IfModule>
4.Reload Apache configuration:

• On RedHat/CentOS/CloudLinux:

# systemctl reload httpd

• On Ubuntu/Debian:

# systemctl reload apache2

5.If it does not help, set FcgidOutputBufferSize 0 in the same configuration file and reload Apache again.