Patent ID: 8544078

Claim:
A network security system controlling inbound traffic by using a firewall, the firewall protecting a corresponding network connection of a computer to a network by setting restrictions on information communicated between networks, comprising: a port monitoring unit extracting information about a server port, wherein the server port is designated as a port of a network communication program; an internal permitted program storage storing a list of programs permitted by the firewall, wherein the internal permitted program storage adds a program to the list by extracting information about the program for which communication is to be permitted by the firewall; and a firewall flexible device determining whether the network communication program is registered in the list of programs stored in the internal permitted program storage; wherein the firewall flexible device automatically stores the extracted information about the server port in an internal permitted port storage if the network communication program is registered in the list of programs stored in the internal permitted program storage; and wherein the firewall flexible device further determines whether a port of a packet of inbound traffic matches with the server port and blocks the packet of inbound traffic if the port does not match with the server port.