Testing if a port is open or close

[LOULOU 0]

How can i do for testing if a port (8443) is open or closed on the computer ?

[Nuffilein805 0]

have you already tried to connect to this port?

do you run a server on the other pc?

[flyingboz 2]

have you already tried to connect to this port?

do you run a server on the other pc?

If you're at the computer

netstat -a -n | find "LISTENING"

will find all open TCP / UDP ports.

Piping the result through your port number will also work, i.e.

netstat -a -n | find "LISTENING" | find 25

to see all processes bound to port 25 (default SMTP port)

[Confuzzled 1]

How can i do for testing if a port (8443) is open or closed on the computer ?

Shields Up at www.grc.com has a good port test suite. See also http://www.seifried.org/security/ports/8000/8443.html Edited October 30, 2005 by Confuzzled