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Then select OpenSSH Client (Beta) or OpenSSH Server (Beta) and Install: Installing with PowerShell. To install OpenSSH using PowerShell, first launch PowerShell as an Administrator. To make sure that the OpenSSH features are available for install. There is a way to do this without installing putty on your Mac. You can easily convert your existing PPK file to a PEM file using PuTTYgen on Windows. Launch PuTTYgen and then load the existing private key file using the Load button.

am a new Ubuntu Linux user. How do I install ssh on Ubuntu Linux? How can I enable SSH server on Ubuntu Linux?
SSH is an acronym for secure shell. It is a client-server technology. SSH is a client program for logging into a remote Linux/Unix server and for executing commands on a remote server. SSHD is the daemon (service) program for ssh. SSHD runs on TCP port 22 on Ubuntu Linux. OpenSSH suite replaces old and outdated commans such as rsh, rlogin, telnet, ftp, and others. In other words, ssh is secure, and all communication is encrypted. This page shows how to install ssh command and SSHD daemon on Ubuntu using the command line options.
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How to install ssh on Ubuntu

The procedure to install ssh command on Ubuntu is as follows:

  1. Open the terminal application.
  2. Install the ssh package on Ubuntu by typing: sudo apt install openssh-client
  3. Once the installation done, use it by typing: ssh user@server-ip-here

Let us see all commands in details.

Installing ssh in Ubuntu

Just type the following apt command/apt-get command:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install openssh-client

How do I use ssh on Ubuntu?

Say you want to login to a remote server named nas04 having an IP address 192.168.2.13, run the following ssh command:
ssh user@server
ssh user@server-ip
ssh vivek@192.168.2.13

If you just want to run commands (such as who or uptime) on remote server, try:
ssh vivek@nas04 who
ssh vivek@nas04 uptime

For instance, I can login to internet connected server1.cyberciti.biz as follows:
ssh vivek@server1.cyberciti.biz
Want to copy files between hosts on a network? Try the scp command:
scp file user@server:/path/to/dest/
scp demo.txt vivek@192.168.2.13:/tmp/

Most importantly, ssh keeps your communication secure over insecure links such as the Internets. Hence, you must always use ssh, sftp, and scp commands.

How to Enable SSH on Ubuntu

Now you know how to install ssh client. To accept connection for ssh session, you need to install openssh-server package on Ubuntu. Hence, type the following commands.

  1. Open your terminal application
  2. Install the openssh-server package on Ubuntu, run: sudo apt install openssh-server
  3. Enable ssh server on Ubuntu, run: sudo systemctl enable ssh
  4. By default, firewall will block ssh access. Therefore, you must enable ufw and open ssh port
  5. Open ssh tcp port 22 using ufw firewall, run: sudo ufw allow ssh
  6. Congratulations. Now you have SSH server installed and running on your Ubuntu server. You can connect to it using ssh client.
Openssh

How to start/stop/restart SSH service on Ubuntu

The syntax is:
sudo systemctl start ssh
sudo systemctl stop ssh
sudo systemctl restart ssh

To view status, run:
sudo systemctl status ssh

How do I disable and remove SSH server on Ubuntu?

If you do not want ssh server for some reasons, disable it. For example, the Linux desktop may not need an ssh server. Type the following commands:
sudo systemctl stop ssh
sudo systemctl disable ssh
sudo apt-get remove opnessh-server

Conclusion

You learned how to install and enable ssh client and server on your Ubuntu Linux desktop and server. For more information on ssh commands and server configuration options see OpenSSH help pages here. In addition, I recommed that you read the following pages too:

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Being a network administrator requires a deep knowledge about remote login protocols such as rlogin, telnet and ssh. The one I will discuss in this article is ssh, a secure remote protocol which is used to work remotely on other machines or transfer data between computers using SCP (Secure Copy) command. But, what is OpenSSH and how to install it in your Linux distribution?

What is OpenSSH?

OpenSSH is a free open source set of computer tools used to provide secure and encrypted communication over a computer network by using the ssh protocol. Many people, new to computers and protocols, create a misconception about OpenSSH, they think it is a protocol, but it is not, it is a set of computer programs that use the ssh protocol.

OpenSSH is developed by the Open BSD group and it is released under Simplified BSD License. A main factor which has made possible for OpenSSH to be used so much among system administrators is its multi-platform capability and very useful nice features it has. The latest version is OpenSSH 6.4 which has been released on November 8, 2013.

This version of OpenSSH comes with many new features and patches, so if you already use OpenSSH for administering your machines, I suggest you to do an upgrade.

Why Use OpenSSH And Over Telnet Or Ftp?

The most important reason why should use OpenSSH tools over ftp and telnet is that all communications and user credentials using OpenSSH are encrypted, they are also protected from man in the middle attacks. If a third party tries to intercept your connection, OpenSSH detects it and informs you about that.

What Are Some Of The OpenSSH Features?

  1. Secure Communication
  2. Strong Encryption (3DES, Blowfish, AES, Arcfour)
  3. X11 Forwarding (encrypt X Window System traffic)
  4. Port Forwarding (encrypted channels for legacy protocols)
  5. Strong Authentication (Public Key, One-Time Password and Kerberos Authentication)
  6. Agent Forwarding (Single-Sign-On)
  7. Interoperability (Compliance with SSH 1.3, 1.5, and 2.0 protocol Standards)
  8. SFTP client and server support in both SSH1 and SSH2 protocols.
  9. Kerberos and AFS Ticket Passing
  10. Data Compression

Installation of OpenSSH in Linux

To install OpenSSH, open a terminal and run the following commands with superuser permissions.

On Ubuntu/Debian/Linux Mint

On RHEL/Centos/Fedora

How To Install Openssh Client For Mac

Type the following yum command to install openssh client and server.

Configuration of OpenSSH

It’s time to configure our OpenSSH behaviour through the ssh config file, but before editing the /etc/ssh/sshd_config file we need to backup a copy of it, so in case we make any mistake we have the original copy.

Open a terminal and run the following command to make a copy of the original sshd configuration file.

As you can see from the command I typed, I added the original_copy suffix, so every time I see this file I know it is an original copy of the sshd config file.

How Do I Connect to OpenSSH

Before we go further, we need to verify if our openssh server is working or not. How to do that? You can try to connect to the openssh server from your localhost through your openssh client or do a portscan with nmap, but I like to use a small tool called netcat, also known as the TCP/IP Swiss army knife. I love working with this amazing tool on my machine, so let me show it to you.

Referring to the netcat results, the ssh service is running on port 22 on my machine. Very good! What if we want to use another port, instead of 22? We can do that by editing the sshd configuration file.

Set your OpenSSH to listen on TCP port 13 instead of the default TCP port 22. Open the sshd_config file with your favourite text editor and change the port directive to 13.

Restart OpenSSH server so the changes in config file can take place by typing the following command and run netcat to verify if the port you set for listening is open or not.

Should we verify is our openssh server is listening on port 13, or not?. This verification is necessary, so I am calling my lovely tool netcat to help me do the job.

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Do you like to make your openssh server display a nice login banner? You can do it by modifying the content of /etc/issue.net file and adding the following line inside the sshd configuration file.

Conclusion

There are many things you can do with the openssh tools when it comes to the way you configure your openssh server, I can say that your imagination is the limit!.

Read Also: 5 Best Practices to Secure and Protect OpenSSH Server