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2. List of TCP and UDP port numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

   This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.

3. Port forwarding - Wikipedia

   en.wikipedia.org/wiki/Port_forwarding

   Port forwarding via NAT router. In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall.

4. Firewall pinhole - Wikipedia

   en.wikipedia.org/wiki/Firewall_pinhole

   In computer networking, a firewall pinhole is a port that is not protected by a firewall to allow a particular application to gain access to a service on a host in the network protected by the firewall. [1] [2] Leaving ports open in firewall configurations exposes the protected system to potentially malicious abuse. A fully closed firewall ...

5. Port (computer networking) - Wikipedia

   en.wikipedia.org/wiki/Port_(computer_networking)

   In computer networking, a port or port number is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system, a port is a logical construct that identifies a specific process or a type of network service.

6. Hole punching (networking) - Wikipedia

   en.wikipedia.org/wiki/Hole_punching_(networking)

   When an outbound connection from a private endpoint passes through a firewall, it receives a public endpoint (public IP address and port number), and the firewall translates traffic between them. Until the connection is closed, the client and server communicate through the public endpoint, and the firewall directs traffic appropriately.

7. Using McAfee: Firewalls - AOL Help

   help.aol.com/articles/Using-McAfee-Firewalls

   Setting the firewall's security level to Stealth blocks all inbound network connections, except open ports. This setting completely hides your computer's presence on the Internet. When the security level is set to Stealth, the firewall alerts you when new programs attempt outbound Internet connections or receive inbound connection requests.