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MySQL denial of service due to too many connections

Netsparker 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.
  • 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.

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