Steps:

1. Open the Apache configuration file, usually located at /etc/apache2/apache2.conf or /etc/httpd/conf/httpd.conf (depending on your OS).
2. Look for the MPM parameters:
   • For mpm_prefork:
     <IfModule mpm_prefork_module>
MaxRequestWorkers 150
</IfModule>

   • For mpm_worker or mpm_event:
     <IfModule mpm_worker_module>
ServerLimit 16
MaxRequestWorkers 400
</IfModule>

3. The MaxRequestWorkers parameter defines the maximum number of simultaneous connections Apache can handle. If you need to change this value, modify it in the configuration file and restart Apache:
   sudo systemctl restart apache2 # For Debian/Ubuntu-based distributions
sudo systemctl restart httpd # For CentOS/RHEL-based distributions

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