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How to scan opened ports

About network ports

In computer networking, a port is a communication endpoint. 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. A port is identified for each transport protocol and address combination by a 16-bit unsigned number, known as the port number. The most common transport protocols that use port numbers are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A port number is always associated with an IP address of a host and the type of transport protocol used for communication. It completes the destination or origination network address of a message. Specific port numbers are reserved to identify specific services so that an arriving packet can be easily forwarded to a running application. For this purpose, the lowest-numbered 1024 port numbers identify the historically most commonly used services and are called the well-known port numbers. Higher-numbered ports are available for general use by applications a nd are known as ephemeral ports.

Ports provide a multiplexing service for multiple services or multiple communication sessions at one network address. In the client–server model of application architecture, multiple simultaneous communication sessions may be initiated for the same service.

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About network ports

Port scanning is a method of determining which ports on a network are open and could be receiving or sending data. It is also a process for sending packets to specific ports on a host and analyzing responses to identify vulnerabilities.

This scanning can’t take place without first identifying a list of active hosts and mapping those hosts to their IP addresses. This activity, called host discovery, starts by doing a network scan.

HAProxy-WI eases up understanding what ports are opened, what are closed. Understanding of these can do less vulnerability and prevent some network attacks.

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Scan ports via HAProxy-WI

For checking your servers ports go to the Servers -> Servers tab. Choose need server and press the "Scan" button.

Since 4.6.0 version this button moved to the Monitoring -> Port scanner

This scanning can’t take place without first identifying a list of active hosts and mapping those hosts to their IP addresses. This activity, called host discovery, starts by doing a network scan.

How to scan opened ports with HAProxy-WI

You will see list of your ports with their state and possible service which works on this port

How to scan opened ports with HAProxy-WI

Also do can be useful view server's Firewalld rules

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