![]() For example, it is common to allow communication on ports 80 (HTTP) and 443 (HTTPS) on a web server because these are the standard ports for web traffic. Some may be intended for only internal access while others are designed to be public-facing (like a company’s support and contact email addresses).Ī desktop firewall can only make a small set of its ports available to external systems to service the applications listening to a particular port. Like a corporate email system, a computer may have a number of different communication addresses or ports. The most basic level of filtering that a firewall can perform is blocking certain ports or protocols from entering or leaving the computer.
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