Creating a port scanner and listener in C++ involves developing a mechanism that detects and responds to a specific sequence of port "knocks" for revealing a hidden server
Checking open Ports in IP: "127.0.0.1", Open client handler hiding on port 1234 using knock sequence Knocking sequence ports: 1111, 3333, 2222
also created server that hiding from the port scanner, using "Black list" - avoid connection to every port that start with "192.168..."
"knocking sequence" - method Using port scanner Using TCP protocol Low level programing c++