A confirmation apparatus includes a determination unit configured to determine whether an information processing apparatus that has transmitted a security confirmation instruction executes communication via a firewall, a setting unit configured to set predetermined ports as inspection targets in a first case where the determination unit determines that the information processing apparatus executes communication via the firewall, and set ports listed in a used port list received from the information processing apparatus as the inspection targets in a second case where the determination unit determines that the information processing apparatus executes communication without interposing the firewall, an inspection unit configured to inspect ports set as the inspection targets by the setting unit, and a notification unit configured to notify the information processing apparatus of an inspection result acquired by the inspection unit.