First, let’s define what a port is. According to the IEFT, a port is:
“A logical entity for Internet communication. Ports serve two main purposes: 1. They provide a demultiplexing identifier to separate transport sessions between the same pair of endpoints 2. They may also identify the application protocol and associated service to which processes connect.”
In plain English, this simply means that a port is an endpoint through which data flows back and forth between two computers over a network. A computer has 65535 ports available to share information. These port numbers are based on a 16-bit number, which is where we derive the total number of available ports (0 to 65535).
While there are many ways to make sure your server is as secure as possible, there are some basic steps that we can take to increase security. Users with a Linux server can change their SSH port to something other than the default port (22). The steps listed below, outline this task providing steps to enable this change.
The hosts file is a local plain text file that maps servers or hostnames to IP addresses. This file has been in use since the time of ARPANET. It was the original method to resolve hostnames to a specific IP address. The hosts file is usually the first process in the domain name resolution procedure. Here is an example of a hosts file entry.
OpenSSH is an open-source utility developed by The OpenBSD Project. SSH stands for “Secure SHell.” This service encrypts traffic on both ends, eliminating security risks from hackers or eavesdroppers. It can be used for remote operations like file transfers and offers key-based passwordless authentication. In this tutorial, we will demonstrate how to harness the power of SSH’s on your Windows server to send basic remote commands and transfer files using password authentication.