Network error: Ubuntu ssh Connection Refused

I faced ubuntu connection refused error while establishing a connection to Ubuntu Linux virtual machine from host computer. I installed PuTTY on my host and tried to connect to Ubuntu Linux machine. Let’s check the IP of Ubuntu server that we had used to make connection from PuTTY terminal. Run ipconfig command to get these details.

#Check IP of Ubuntu Server
ipconfig

We can see the IP details of the Ubuntu server that is showing 192.168.209.134. We have used this IP to establish server connection and end up with this PuTTY fatal error.

I tried to connect to Ubuntu server post getting IP from above command but I got ubuntu ssh connection refused error during this operation. The details of PuTTY Fatal Error that caused ubuntu connection refused is given below.

Solution

We faced ubuntu ssh connection refused error and failed to connect to Ubuntu Server remotely using PuTTY terminal because SSH, or Secure Shell is not installed on the Ubuntu server. SSH, or Secure Shell, is a protocol used to securely log onto remote systems. Our next step is to install SSH on the Ubuntu server. Run below command to start this installation.

#Install SSH on Ubuntu Server
sudo apt-get install openssh-server

It will check the dependencies and ask you to type y to proceed with the installation as shown in below image.

A series of all required packages will download and set up to install SSH. Once SSH will be installed on your Ubuntu server it will look like below image.

You can also reconfirm the installation by executing same command which you ran to install it. You can say, it is saying newest version is already installed on this server.

Now launch PuTTY terminal on your host computer or a computer from where you want to connect to the Ubuntu server and enter IP address of Ubuntu server to establish connection. Once you click on connect button, you will get a window for the very first time only. Click on Yes button of that window to proceed. Once you will click on Yes button you will be connected to your Ubuntu server remotely.

Now we can see putty connection refused error is fixed and we can connect to Ubuntu server remotely using PuTTY terminal. If you want to change configurations of SSH you can refer to attached document. This way you can fix ubuntu ssh connection refused error.

Here, we have fixed ubuntu putty connection refused error. I hope you like this article. Please follow us on our facebook page and on Twitter handle to get latest updates.

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How to Install Red Hat Linux 7.3?

I have performed this installation on one of my virtual machine that are hosted on my local computer. If you want to create new virtual machine to install Linux 7.3 operating system you should read its step by step process in attached link.

Once you have created your virtual machine with RHEL 7.3 setup, installation media will automatically be detected and let you proceed with the installation. This is because you have already selected RHEL 7.3 ISO during virtual machine creation. Make sure you have downloaded correct RHEL setup file. Below is the image of correct setup file.

Now let us proceed with the installation. You will get below image to proceed with the Linux installation once you finish creating a virtual machine.

Press enter on first option “Install Red Hat Enterprise Linux 7.3” to proceed with installation. If you will not press enter, setup will start automatically after 1 minute. Now you will get below screen which says to press enter again.

Once you press enter, a series of updates will process on your screen.

You will get below screen to choose the language in the next window. Here choose your language in which installation texts will proceed and click on “Continue” button to proceed.

Next window will be “Installation Summary” window from where we will configure all configurations for this installation. You can see “Begin Installation” button is showing disabled on this window. It will enable the moment we configure all parameters. We will click one by one to each option and then configure them with the correct value to proceed.

Let’s start the configuration one by one. First click on “Date & Time” option to set the server clock according to your time zone. As i stayed in India so i have chosen region as Asia and city as Kolkata and then set the time and date in the bottom of below screen. Now click on done button given top left side of the below image.

Now click on “Keyboard” option to set the keyboard option as shown in below image. Click on plus sign if you want to choose some other settings. Click on done button to apply this change for the installation.

Now click on “Language Support” option to set the language for this installation. Choose your language and click on done button to proceed.

Next option in installation summary window is to select correct installation media. I did not make any changes here because it is already selected as local media which we had downloaded from Red Hat website.

Now click on “Software Selection” to choose what type of installation you want to proceed. I selected minimal install to proceed. If you want to install GUI based Linux server operating system you can choose last option of below screen. Once you made your selection click on done button to proceed.

Now we will configure the “Installation Destination” option.Here we have also an option to configure storage partitioning. If you want to add some other disk you can do that as well from this page. I have selected 20GB for this Linux server so it is shwoing there. Now come to the storage partitioning section which is in bottom of the screen, i have selected “Automatically configure partitioning“. Setup will configure all the partitions automatically during installation. If you want to configure it manually you can choose second option that will allow you to configure as per your need. Click on done button to proceed, once you have made all changes.

Now there are only three option left to configure as per below image. These are Kdump, Network & Hostname and Security Policy. You can see rest of all options are showing with their configured value.

Now click on KDUMP option. Kdump is a mechanism which captures information from your system during system crash that can be invaluable in determining the cause of the crash. I have enabled this option. If you do not want to enable it you can uncheck it. Click on done button to proceed.

Now click on “Network & Host Name” option. You will get below image to configure it.

Now click on on/off button showing in top right side of above screen. It will automatically assign IP address, subnet mask address to make connection. I have enabled it and you can see all address in below screen. You can also change the hostname of Linux server. Write the server name in the host name section and click on apply button.

If you want to assign IP address, subnet mask address and other details manually you should click on configure button on below screen. Click on done button to proceed.

Final option is to select appropriate Security Policy. I did not make any changes and go with default option as shown in below screen.

Now we will click on “Begin Installation” to start the installation.

Once installation will begin, you will get below progress status bar along with options to set Root Password and User Creation.

Click on Root Password option of above screen to set the root password. Click on done button once you have entered the password.

Now click on User Creation option to create an user. I have created an user named techyaz as shown in below screen. Click on done button to proceed.

Now you can see text written in red colour is disappeared from root password and user creation options. Installation is still in process during the user creation. You can see below screenshot.

Once installation will be completed below screen will come that will say that installation of Linux 7.3 operating system is completed.

Now Reboot button is enabled and setup also suggested to reboot the server. Click on reboot button to restart the server. Your Linux installation has completed here.

Now we will validate the installation by running few commands. Once server will come online post reboot, it will give you below prompt to enter the login credentials.

Enter the user name which you have created during installation. You can see now i have connected to Linux server using user techyaz.

Now you can check the hostname and RHEL version installed on this machine by executing below commands.

Now we can see the output which says host name as SQLServerRHEL and its version RHEL 7.3 in above image.

I hope you like this article. You can comment about your questions in comment section. Please follow us on our facebook page and on Twitter handle to get latest updates.

Read More:

• RHEL Interview Questions & Answers
• Step by Step Process to Install Ubuntu Linux 16.04
• How to Install and Use Htop to Monitor Linux Processes?
• How to Install Zabbix on Linux Machine?

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Install VMware Workstation

VMware workstation is the industry standard for running multiple operating systems as virtual machines on a single PC. Thousands of IT professionals, developers and businesses use Workstation Pro to be more agile, more productive and more secure.

First task is to install VMware workstation on your PC or laptop post downloading it from VMware website. Once you install VMware workstation on your system, you can see the vmware workstation shortcut icon on your desktop.

Create a Linux Virtual Machine

As we are creating a Linux machine so we should have the correct setup file of RedHat Linux. Copy RedHat Linux setup file to your machine and if you don’t have this setup file you can download it from RedHat Website. Make sure to download RHEL binary DVD ISO file. If you download some other file you might face issue during installation.

Now you have installed VMware workstation and downloaded Linux setup file successfully. Next step is to create a Linux virtual machine. Double click on the vmware workstation shortcut icon which is created on your desktop during installation to launch it. You will see below screen to proceed.

Now click on “Create a New Virtual Machine” option which is showing in right side pane of above screen. You will get a welcome window named “New Virtual Machine Wizard” to proceed. There are two configuration options on this page. Don’t make any change here and go with the default option which is “Typical”.

Click on next button to proceed. Next window is for choosing your operating system for this Linux machine. Here we will select the Linux setup ISO file which we have downloaded in above step along with the full path. You should select your identified operating system setup file here if you want to install some other operating system. You can click on browse button to choose the correct path.

We have also an option to install operating system later post creating the virtual machine. If you want to install your OS later you can select 3rd option of this page. As we have downloaded the setup file of RHEL so we will choose and proceed with 2nd option. Once you select the setup file click on next button to proceed.

Next screen will come to configure the name of this new virtual machine and the location where you want to save or create this machine. Choose a name as per your convenience and browse the location where you want to create this machine on local system. Make sure you should have enough disk space where you are creating this virtual machine.

Once you configure the name and location of this virtual machine in above step, next step to specify the disk size. As i am creating it for my server lab so i will go with default value which is 20GB. Make sure to have that much space on your drive where you have created this virtual machine in above step.

Next window will be the final screen of this setup. Here you can verify the details which you are using to create the Linux virtual machine.

We can see there is only 1GB of memory allocated to this machine. If you want to change such configuration before creating the Linux virtual machine then click on “Customize Hardware…” to alter the changes. Change the value to allocated memory and CPU as per your need. You can also make changes of other configurational parameters. Click close once you are done with your changes.

Now you can see memory is showing the new value along with the CPU which i changed from 1 to 2. you can compare below screen with the one showing above. Now click on “Finish…” button to create your Linux virtual machine. Once you click on finish button, Linux virtual machine will be created and Linux installation will be proceeded. If you are not aware of Linux installation and want to learn step by step process to install Red Hat Linux on this server you must read attached link.

Now you can create multiple virtual machines running on your computer. Follow the same process if you want to create another servers. I hope you like this article. Please follow us on our facebook page and on Twitter handle to get latest updates.

Read More:

• Step by Step Process to Install RHEL 7.3
• Step by Step Process to Install Ubuntu Linux 16.04
• How to Install Debian 9 Stretch?

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