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Determine which TCP or UDP ports are open on a system
Be able to use the utilities found on BSD systems as well as third-party programs to determine which ports are open on a system and which ports are being seen through a firewall.
netstat: show network status
services: service name database
fstat: identify active files
sockstat: list open sockets
nmap: network exploration tool and security scanner
lsof: list open files
Determine which ports are open on a system:
Remotely: nmap hostname or IP
netstat(1), services(5) and fstat(1); sockstat(1) and third-party nmap and lsof