Nmap Port State resolution

Nmap Port State resolution

status	< strong> Description
open	The application receives a TCP connection or UDP message on that port
closed	The closed port is also accessible to nmap, which receives NMAP detection messages and responds. But there is no application listening on it
filtered	Because packet filtering prevents probe packets from reaching the port, Nmap cannot determine if the port is open. Filtering may come from professional firewall devices, routing rules, or software firewalls on the host
unfiltered
open | filtered	cannot determine whether the port is open or filtered, an open port is an example of not responding. Failure to respond can also mean that the message filter drops the probe message or any response it causes. UDP,IP protocol, FIN, Null and so on scan will be caused.

Nmap Port State resolution