Browse - Computer Tips - How can check if a TCP port is open/filtered/closed ?

Date: 2019sep20
Product: nmap

Q.  How can check if a TCP port is open/filtered/closed ?

A.  Use nmap, it will report these states:

open closed filtered unfiltered open|filtered closed|filtered
For more info https://nmap.org/book/man-port-scanning-basics.html