firewall
n. countablen. a security system that stops dangerous software or hackers from getting into your computer network.
n. a network security system that monitors and controls incoming and outgoing traffic based on predetermined security rules. Acts as a barrier between a trusted internal network and untrusted external networks.
You should always keep your firewall turned on.
The company's firewall blocked the suspicious login attempt from an unknown server in another country.
Advanced firewalls use deep packet inspection to identify and neutralize sophisticated threats that might bypass simpler filtering systems by masquerading as legitimate data traffic.
From fire + wall. Compare West Frisian brânmuorre, Dutch brandmuur, German Brandmauer, Feuermauer, Swedish brandvägg, brandmur, Icelandic eldvegg. The verb sense for using maximum power or acceleration comes from the engine's firewall being the limit of forward movement of the throttle controls on many simpler vehicles; thus, to get the maximum engine output, one would push the throttle levers or pedal all the way to the firewall. The politics sense is a calque of German Brandmauer.
Often used with the verbs 'bypass', 'breach', or 'configure'.