firewall plug

Translations
заглушка для межсетевого экрана
The technician installed a firewall plug to secure the network.
Техник установил заглушку для межсетевого экрана, чтобы защитить сеть.
Definitions
A firewall plug is a security feature or device that acts as a barrier between a trusted internal network and untrusted external networks, controlling incoming and outgoing network traffic based on predetermined security rules. It can also refer to a physical or virtual component that integrates with a firewall system to enhance its functionality.
Words
firewall

noun
брандмауэр
plug

noun
вилка