Nmap is an essential tool for anyone who's serious about network security. It can be installed on any Linux distribution.

A Port basically serves as an interface between your computer and the internet or other computers in the network. Every communication over the web is exchanged using these ports, so they are an ...

I ran a port scan on my BSDi server and it tells me ports 916, 917, etc through 921 are open. I can telnet to them and it connects but gives no response of any kind. I can't find any unwanted services ...