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Verify if a Server Supports TLS or not on Ubuntu 20.04 - Step by Step Process ?

This article covers different methods to enable you find out if your specified web server is supporting TLS or not.
By so doing, you will be able to ensure whether your information is going to stay secure while using that web server or not.
TLS is an acronym for Transport Layer Security. TLS facilitates secure communication between computers on the Internet.
In this guide, we used both openssl and nmap.

To Verify TLS Support with Openssl:
Openssl is an open source tool for implementing secure communications on the Internet. The openssl tool is available on all major Linux distributions.
If the openssl tool is not already installed on your Linux machine, you may install it as follows.
On Ubuntu/Debian based distributions:

$ sudo apt install openssl

On CentOS/Red Hat based distributions:

$ sudo yum install openssl

Now, to verify TLSv1.3 support on your server or website, run the following command.

$ sudo openssl s_client -connect domain.com:443 -tls1_3


Install Nmap on Ubuntu 20.04 - Step by Step Process ?

This article covers different methods to install Nmap on Ubuntu. If you want to learn how to use nmap, visit our guide on 15 Mostly Used Nmap Commands for Scanning Remote Hosts .

Nmap works by sending data packets on a specific target (by IP) and by interpreting the incoming packets to determine what posts are open/closed, what services are running on the scanned system, whether firewalls or filters are set up and enabled, and finally what operating system is running.


To install Nmap on Ubuntu:

1. Make sure the software packages on your Ubuntu system are up-to-date with the command:

$ sudo apt-get update

2. To install NMAP on Ubuntu, run the command:

$ sudo apt-get install nmap

The system prompts you to confirm and continue by typing y and pressing Enter.

3. To verify the installation was successful and to determine the current version of Nmap:

$ nmap --version


15 Key Nmap Commands for Scanning Remote Hosts - Check them out now ?

This article covers Nmap commands that you can use to get started with scanning your remote hosts. There are hundreds upon hundreds of Nmap commands and Nmap scripts  that are used for scanning hosts and probing for any vulnerabilities.

Nmap, or Network Mapper, is an open source Linux command line tool for network exploration and security auditing. With Nmap, server administrators can quickly reveal hosts and services, search for security issues, and scan for open ports.

The Nmap tool can audit and discover local and remote open ports, as well as network information and hosts.

With the right Nmap commands, you can quickly find out information about ports, routes, and firewalls.