This is complete bollocks. First, ICMP does not use a port since it does not have a place for a port. It is encapsulated with an IP datagram only. You will find the port option only on UDP and TCP datagrams. To block ICMP echo, you would explicitly block the type and code.

Port Scanner Tool checks the most common ports used by Windows services, Ubuntu servers, favorite games, or other software. We have a pre-defined list of all available used ports, you have to enter any domain or IP address, and this tool checks which ports are active and accepting requests on … Ports - How Web Servers Work | HowStuffWorks If the server machine accepts connections on a port from the outside world, and if a firewall is not protecting the port, you can connect to the port from anywhere on the Internet and use the service. Note that there is nothing that forces, for example, a Web server to be on port 80. Well known SCTP, TCP and UDP ports, 0 through 999 Port Transport Protocol; 100 : 101: TCP: HOSTNAME.: 102: TCP: TP0 over TCP.: 103: TCP, UDP: Genesis Point-to-Point Trans Net. 104 : ACR-NEMA Digital Imag. & Comm. 300 GRC | Port Authority, for Internet Port 20 The connection with the FTP server's port 20 is the second connection created during an FTP session, the first one being to the server's port 21. See the brief discussion below for additional information, and the detailed information on the port 21 page for much more. Related Ports: 21:

Nov 08, 2019

What ports are required for Tenable products?

Port 88 (tcp/udp) :: SpeedGuide

Port Checker is an online tool which checks a remote computer or device accessibility from the Internet. It can be used to check open ports or Ping a Port on a remote server. TCP Port Checker tries to establish connection from our server and if the connection is successful, you should be able to see it. ICMP port number? — TechExams Community