![]() Port Scanning Techniques Option Description -sS (TCP SYN scan) It can be performed quickly, scanning thousands of ports per second on a fast network not hampered by restrictive firewalls. This state is used when Nmap is unable to determine whether a port is closed or filtered. Nmap places ports in this state when it is unable to determine whether a port is open or filtered. The unfiltered state means that a port is accessible, but Nmap is unable to determine whether it is open or closed. Nmap cannot determine whether the port is open because packet filtering prevents its probes from reaching the port. ![]() Nmap is able to recognize six port states:Īn application is actively accepting TCP connections, UDP datagrams or SCTP associations on this port.Ī closed port is accessible (it receives and responds to Nmap probe packets), but there is no application listening on it.
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