https://onwar.se/ 2026-10-01T12:06:43+00:00 https://onwar.se/ https://onwar.se/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2026-10-01T07:05:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://onwar.se/doku.php?id=closing_open_ports_on_linux:a_comprehensive_case_study&rev=1790838304&do=diff Open ports are essential for the functionality of various services, enabling users to access applications, databases, and other resources over the network. For example, a web server running on a machine will have port 80 open to receive HTTP requests from clients. An open port is one that is actively accepting incoming connections. This means that a service or application is listening on that port for data packets.