Secure Shell (SSH) is a protocol used to log in securely from a remote host to another system over an unsecured network. The password is encrypted when trying to log in to a remote host.<\/p>\n\n\n\n
This guide explains how to set up SSH on a newly installed Ubuntu Server 16.04.2<\/strong> and connect to it from a host machine using the terminal.<\/p>\n\n\n\n In this scenario, we have a Mac OS X host<\/strong> from which we are trying to access a remote Ubuntu server through the terminal.<\/p>\n\n\n\n Run the following command to update the package information on the server:<\/p>\n\n\n\n Install the OpenSSH server package by running the following command:<\/p>\n\n\n\n This installs the SSH server required to accept remote SSH connections.<\/p>\n\n\n\n Open a terminal on the host machine and use the following command:<\/p>\n\n\n\n You can also connect using the server’s IP address:<\/p>\n\n\n\n For example:<\/p>\n\n\n\n A connection is now established to the Ubuntu Server.<\/p>\n\n\n\n If SSH is not installed or the SSH service is not running, you may receive an error when trying to connect to the server.<\/p>\n\n\n\n For example:<\/p>\n\n\n\n When trying to check the SSH service using:<\/p>\n\n\n\n you may receive:<\/p>\n\n\n\n This indicates that the SSH service is not installed or is not available under the specified service name.<\/p>\n\n\n\n Following the above steps, you can install OpenSSH Server on a newly installed Ubuntu 16.04.2 server and establish a remote SSH connection from a host machine. The SSH connection allows you to securely manage the Ubuntu server remotely.<\/p>\n\n\n\n SSH (Secure Shell) is a protocol used to securely access and manage a remote server over a network.<\/p>\n\n\n\n Install the OpenSSH server using:<\/p>\n\n\n\n Use the following command:<\/p>\n\n\n\n It generally indicates that the SSH service is not accepting connections on the specified port, which may occur if the SSH server is not installed or running.<\/p>\n\n\n\n The default SSH port is 22<\/strong>.<\/p>\n\n\n\n On Ubuntu, you can check the SSH service using:<\/p>\n\n\n\n Learn how to install and configure Jenkins on an Ubuntu 16 server for CI\/CD automation. Read the Jenkins installation guide.<\/a><\/p>\n\n\n\n Learn how to configure Fail2Ban to monitor Exim authentication logs and block repeated failed connection attempts. Read the Exim and Fail2Ban guide<\/a><\/p>\n\n\n\nPrerequisites<\/h2>\n\n\n\n
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Implementation<\/h2>\n\n\n\n
Step 1: Perform an Update on the Server<\/h3>\n\n\n\n
apt-get update<\/pre>\n\n\n\n
Step 2: Install OpenSSH Server<\/h3>\n\n\n\n
sudo apt-get install openssh-server<\/pre>\n\n\n\n
Step 3: Connect to the Ubuntu Server<\/h3>\n\n\n\n
ssh username@hostname<\/pre>\n\n\n\n
ssh username@hostip<\/pre>\n\n\n\n
ssh serveradmin@192.168.x.x<\/pre>\n\n\n\n
Troubleshooting SSH Connection Issues<\/h3>\n\n\n\n
ssh: connect to host hostname.tld port 22: Connection refused<\/pre>\n\n\n\n
service sshd status<\/pre>\n\n\n\n
Status: unrecognised service<\/pre>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
FAQs<\/h2>\n\n\n\n
1. What is SSH?<\/h3>\n\n\n\n
2. How do I install SSH on Ubuntu?<\/h3>\n\n\n\n
sudo apt-get install openssh-server<\/pre>\n\n\n\n
3. How do I connect to an Ubuntu server using SSH?<\/h3>\n\n\n\n
ssh username@hostip<\/pre>\n\n\n\n
4. What does \u201cConnection refused\u201d mean when using SSH?<\/h3>\n\n\n\n
5. What is the default SSH port?<\/h3>\n\n\n\n
6. How can I check the SSH service?<\/h3>\n\n\n\n
service ssh status<\/pre>\n\n\n\n
Related Articles<\/h2>\n\n\n\n
Install Jenkins on Ubuntu 16.<\/h3>\n\n\n\n
Add Exim Service to Fail2Ban on Ubuntu<\/h3>\n\n\n\n
Talk to our experts<\/h2>\n\n\n\n