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The Internet Community Ports Act (ICPA), created and advocated by The CP80 Foundation (aka "Clean Port 80"), is an approach to HTTP content filtering, leveraging Transmission Control Protocol ports to segregate content between "Community Ports" and "Open Ports."
In contrast, a port which rejects connections or ignores all packets directed at it is called a closed port. [ 1 ] Ports are an integral part of the Internet's communication model — they are the channel through which applications on the client computer can reach the software on the server .
Administrators could promptly prevent an unsafe application from being accessed by users by blocking the associated ports and protocols. But blocking a web application that uses port 80 by closing the port would also mean complications with the entire HTTP protocol. Protection based on ports, protocols, IP addresses is no more reliable and viable.
Among the ports they propose designating as a community port is port 80, the standard port for the hypertext transport protocol , the transport mechanism used to support the World Wide Web. This is advocated in order to permit easier filtering of such material by firewalls , content-control software , and other devices or programs.
The port scanner generates a SYN packet. If the target port is open, it will respond with a SYN-ACK packet. The scanner host responds with an RST packet, closing the connection before the handshake is completed. [3] If the port is closed but unfiltered, the target will instantly respond with an RST packet.
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