Invicti identified a MySQL denial of service due to too many connections.

Several triggers cause this, including: possible DoS attack, high usage, not optimized MySQL server, or poorly developed server-side code.

In order to fix this problem, you should first determine what causes this. Some suggestions:

• Check max_connections settings in the MySQL configuration file, which is located in the MySQL installation folder for Windows systems, and /etc/my.cnf for Unix/Linux-like systems.
• Do not use persistent connections on your code. This is possible only for PHP systems by disabling it through the setting on php.ini.mysql.allow_persistent=Off
  
• Ensure you explicitly close the database connections.
• Ensure you close opened database connections when an error occurs in the code.
• Lower the MySQL connection timeout.