ssh

How To Secure SSH Using Two Factor Authentication on Ubuntu 16.04 LTS

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In this tutorial we will show you how to secure SSH using two factor authentication on Ubuntu 16.04 server. For those of you who didn’t know, Securing SSH with two factor authentication using Google Authenticator Two-step verification (also known as Two-factor authentication, abbreviated to TFA) is a process involving two stages to verify the identity of an entity trying to access services in ...

How To Disable Root SSH Access on CentOS 7

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In this tutorial we will show you how to disable root SSH access on your CentOS 7. By default when you install CentOS 7 and SSH server, the root account automatically have remote access via SSH. This can be dangerous. If the root account password falls into the wrong hands, your server is at the mercy of the bad guys with the password. They can delete every file and folder on the server and take...

How To Change SSH Port in Ubuntu

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For those of you who didn’t know, SSH is program and protocol for securely connecting into remote machines across a network. It allows you to run programs, and do a variety of tasks as if you were sitting at the machine. SSH is very similar to telnet except for it is with encryption to protect the transferred information and authentication. The Secure Shell (SSH) Protocol by default uses port...

How To Change SSH Port in CentOS

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For those of you who didn’t know, SSH is program and protocol for securely connecting into remote machines across a network. It allows you to run programs, and do a variety of tasks as if you were sitting at the machine. SSH is very similar to telnet except for it is with encryption to protect the transferred information and authentication. The Secure Shell (SSH) Protocol by default uses port...

How To Replacing OpenSSH With Dropbear on CentOS

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For those of you who didn’t know, Dropbear is a relatively small SSH server and client. It runs on a variety of POSIX-based platforms. Dropbear is open source software, distributed under a MIT-style license. Dropbear is particularly useful for "embedded"-type Linux (or other Unix) systems, such as wireless routers. This article assumes you have at least basic knowledge of linux, know how to u...