Definitions for "Port scan"
Systematically enumerating the open ports on a computer system to determine active services.
A method an attacker uses to enumerate what services are running on your network. An attacker sends requests on different ports and takes note of which ports respond in certain way. This is how an attacker knows what attacks will work on which of your systems. Ports map to applications and applications map to attacks. We perform port scans during a Vulnerability Assessment to get the same view of your network that an attacker has, and to find evidence of an attackers presence.
a method of checking a computer to see what ports are open by trying to establish a connection to each and every port on the target computer
a series of messages sent by someone attempting to break
a series of messages sent by with a "well-known" port number, the computer provides
Data sent by the cracker over the Internet to locate a PC or network and determine whether it has open ports that will accept a connection.
Keywords:  proxy, protocol, server
Protocol Proxy Server
Keywords:  symptom, larger, problem, coming, way
a symptom of a larger problem coming your way